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• Javascript: prototypal inheritance and the prototype property

  - by JanD

  Hi, I have a simple code fragment in JS working with prototype inheritance. function object(o) { function F() {} F.prototype = o; return new F(); } //the following code block has a alternate version var mammal = { color: "brown", getColor: function() { return this.color; } } var myCat = object(mammal); myCat.meow = function(){return "meow";} that worked fine but adding this: mammal.prototype.kindOf = "predator"; does not. ("mammal.prototype is undefined") Since I guessed that object maybe have no prototype I rewrote it, replacing the var mammal={... block with: function mammal() { this.color = "brown"; this.getColor = function() { return this.color; } } which gave me a bunch of other errors: "Function.prototype.toString called on incompatible object" and if I try to call _myCat.getColor() "myCat.getColor is not a function" Now I am totally confused. After reading Crockford, and Flanagan I did not get the solution for the errors. So it would be great if somebody knows... - why is the prototype undefined in the first example (which is foremost concern; I thought the prototype of explicitly set in the object() function) - why get I these strange errors trying to use the mammal function as prototype object in the object() function? Edit by the Creator of the Question: These two links helped a lot too: Prototypes_in_JavaScript on the spheredev wiki explains the way the prototype property works relativily simple. What it lacks is some try-out code examples. Some good examples are provided by Morris John's Article. I personally find the explanations are not that easy as in the first link, but still very good. The most difficult part even after I actually got it is really not to confuse the .prototype propery with the internal [[Prototype]] of an object.

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• Business Objects - Containers or functional?

  - by Walter

  Where I work, we've gone back and forth on this subject a number of times and are looking for a sanity check. Here's the question: Should Business Objects be data containers (more like DTOs) or should they also contain logic that can perform some functionality on that object. Example - Take a customer object, it probably contains some common properties (Name, Id, etc), should that customer object also include functions (Save, Calc, etc.)? One line of reasoning says separate the object from the functionality (single responsibility principal) and put the functionality in a Business Logic layer or object. The other line of reasoning says, no, if I have a customer object I just want to call Customer.Save and be done with it. Why do I need to know about how to save a customer if I'm consuming the object? Our last two projects have had the objects separated from the functionality, but the debate has been raised again on a new project. Which makes more sense? EDIT These results are very similar to our debates. One vote to one side or another completely changes the direction. Does anyone else want to add their 2 cents? EDIT Eventhough the answer sampling is small, it appears that the majority believe that functionality in a business object is acceptable as long as it is simple but persistence is best placed in a separate class/layer. We'll give this a try. Thanks for everyone's input...

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• Java: Is clone() really ever used? What about defensive copying in getters/setters?

  - by GreenieMeanie

  Do people practically ever use defensive getters/setters? To me, 99% of the time you intend for the object you set in another object to be a copy of the same object reference, and you intend for changes you make to it to also be made in the object it was set in. If you setDate(Date dt) and modify dt later, who cares? Unless I want some basic immutable data bean that just has primitives and maybe something simple like a Date, I never use it. As far as clone, there are issues as to how deep or shallow the copy is, so it seems kind of "dangerous" to know what is going to come out when you clone an Object. I think I have only used clone() once or twice, and that was to copy the current state of the object because another thread (ie another HTTP request accessing the same object in Session) could be modifying it. Edit - A comment I made below is more the question: But then again, you DID change the Date, so it's kind of your own fault, hence whole discussion of term "defensive". If it is all application code under your own control among a small to medium group of developers, will just documenting your classes suffice as an alternative to making object copies? Or is this not necessary, since you should always assume something ISN'T copied when calling a setter/getter?

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• Button Visibility Converter

  - by developer

  Hi All, I have a requirement wherein I need to display on a User form, a Create Button if that user has doesnt have a profile and a Edit Button if he does have a profile. I am using a converter to change the visibility of the button. Below is my code, <StackPanel Orientation="Horizontal"> <Button Content="Create Profile" Visibility="{Binding Profile,Converter={StaticResource ButtonVisibilityConverter}, ConverterParameter='Create'}" Command="local:LaunchEditor" CommandParameter="{Binding}"/> <Button Content="Edit Profile" Visibility="{Binding Profile,Converter={StaticResource ButtonVisibilityConverter}, ConverterParameter='Edit'}" Command="local:LaunchEditor" CommandParameter="{Binding}"/> </StackPanel> Below is my converter code public class ButtonVisibilityConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { string btName = null; btName = (string)parameter; if ((value==null)&&(btName=="Create")) { return Visibility.Visible; } else if ((value != null) && (btName=="Edit")) { return Visibility.Visible; } else { return Visibility.Collapsed; } } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } Everything works fine initially, but the moment I click on the Create Profile window, and it is the constructor that loads the profile window, after that even if I close that window without doing anything, the Create button turns to edit. My guess is that, it is because the constructor would have create the profile object and so even though the object is empty it shows me edit button instead of create. Is there any other way I could display button visibility??

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• JPA2 Criteria API creates invalid SQL when using groupBy

  - by Stephan

  JPA2 with the Criteria API seems to generate invalid SQL for PostgreSQL. For this code: Root<DBObjectAccessCounter> from = query.from(DBObjectAccessCounter.class); Path<DBObject> object = from.get(DBObjectAccessCounter_.object); Expression<Long> sum = builder.sumAsLong(from.get(DBObjectAccessCounter_.count)); query.multiselect(object, sum).groupBy(object); I get the following exception: ERROR: column "dbobject1_.id" must appear in the GROUP BY clause or be used in an aggregate function The generated SQL is: select dbobjectac0_.object_id as col_0_0_, sum(dbobjectac0_.count) as col_1_0_, dbobject1_.id as id1001_, dbobject1_.name as name1013_, dbobject1_.lastChanged as lastChan2_1013_, dbobject1_.type_id as type3_1013_ from DBObjectAccessCounter dbobjectac0_ inner join DBObject dbobject1_ on dbobjectac0_.object_id=dbobject1_.id group by dbobjectac0_.object_id Obviously, the first item of the select statement (dbobjectac0_.object_id) does not match the group by clause. Simplified example It does not even work for this simple example: Root<DBObjectAccessCounter> from = query.from(DBObjectAccessCounter.class); Path<DBObject> object = from.get(DBObjectAccessCounter_.object); query.select(object).groupBy(object); which returns select dbobject1_.id as id924_, dbobject1_.name as name933_, dbobject1_.lastChanged as lastChan2_933_, dbobject1_.type_id as type3_933_ from DBObjectAccessCounter dbobjectac0_ inner join DBObject dbobject1_ on dbobjectac0_.object_id=dbobject1_.id group by dbobjectac0_.object_id Does anyone know how to fix this?

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• Resolve php "deadlock"

  - by Matt

  Hey all, I'm currently running into a situation that I guess would be called deadlock. I'm implementing a message service that calls various object methods.. it's quite similar to observer pattern.. Here's whats going on: Dispatcher.php Dispatcher.php <? class Dispatcher { ... public function message($name, $method) { // Find the object based on the name $object = $this->findObjectByName($name); // Slight psuedocode.. for ease of example if($this->not_initialized($object)) $object = new $object(); // This is where it locks up. } return $object->$method(); ... } class A { function __construct() { $Dispatcher->message("B", "getName"); } public function getName() { return "Class A"; } } class B { function __construct() { // Assume $Dispatcher is the classes $Dispatcher->message("A", "getName"); } public function getName() { return "Class B"; } } ?> It locks up when neither object is initialized. It just goes back and forth from message each other and no one can be initialized. Any help would be immensely helpful.. Thanks! Matt Mueller

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• Resolve php endless recursion issue

  - by Matt

  Hey all, I'm currently running into an endless recursion situation. I'm implementing a message service that calls various object methods.. it's quite similar to observer pattern.. Here's whats going on: Dispatcher.php class Dispatcher { ... public function message($name, $method) { // Find the object based on the name $object = $this->findObjectByName($name); // Slight psuedocode.. for ease of example if($this->not_initialized($object)) $object = new $object(); // This is where it locks up. } return $object->$method(); ... } class A { function __construct() { $Dispatcher->message("B", "getName"); } public function getName() { return "Class A"; } } class B { function __construct() { // Assume $Dispatcher is the classes $Dispatcher->message("A", "getName"); } public function getName() { return "Class B"; } } It locks up when neither object is initialized. It just goes back and forth from message each other and no one can be initialized. I'm looking for some kind of queue implementation that will make messages wait for each other.. One where the return values still get set. I'm looking to have as little boilerplate code in class A and class B as possible Any help would be immensely helpful.. Thanks! Matt Mueller

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• Generic property- specify the type at runtime

  - by Lirik

  I was reading a question on making a generic property, but I'm a little confused at by the last example from the first answer (I've included the relevant code below): You have to know the type at compile time. If you don't know the type at compile time then you must be storing it in an object, in which case you can add the following property to the Foo class: public object ConvertedValue { get { return Convert.ChangeType(Value, Type); } } That's seems strange: it's converting the value to the specified type, but it's returning it as an object when the value was stored as an object. Doesn't the returned object still require un-boxing? If it does, then why bother with the conversion of the type? I'm also trying to make a generic property whose type will be determined at run time: public class Foo { object Value {get;set;} Type ValType{get;set;} Foo(object value, Type type) { Value = value; ValType = type; } // I need a property that is actually // returned as the specified value type... public object ConvertedValue { get { return Convert.ChangeType(Value, ValType); } } } Is it possible to make a generic property? Does the return property still require unboxing after it's accessed?

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• How to highlight the new created file in JTree

  - by newbie123

  I want to make it like when I click a button, it will create a new file. Then the jTree will highlight the new file. Below are my code. Currently I create new file, i will show the new file but no highlight the file. class FileTreeModel implements TreeModel { private FileNode root; public FileTreeModel(String directory) { root = new FileNode(directory); } public Object getRoot() { return root; } public Object getChild(Object parent, int index) { FileNode parentNode = (FileNode) parent; return new FileNode(parentNode, parentNode.listFiles()[index].getName()); } public int getChildCount(Object parent) { FileNode parentNode = (FileNode) parent; if (parent == null || !parentNode.isDirectory() || parentNode.listFiles() == null) { return 0; } return parentNode.listFiles().length; } public boolean isLeaf(Object node) { return (getChildCount(node) == 0); } public int getIndexOfChild(Object parent, Object child) { FileNode parentNode = (FileNode) parent; FileNode childNode = (FileNode) child; return Arrays.asList(parentNode.list()).indexOf(childNode.getName()); } public void valueForPathChanged(TreePath path, Object newValue) { } public void addTreeModelListener(TreeModelListener l) { } public void removeTreeModelListener(TreeModelListener l) { } } class FileNode extends java.io.File { public FileNode(String directory) { super(directory); } public FileNode(FileNode parent, String child) { super(parent, child); } @Override public String toString() { return getName(); } } jTree = new JTree(); jTree.setBounds(new Rectangle(164, 66, 180, 421)); jTree.setBackground(SystemColor.inactiveCaptionBorder); jTree.setBorder(BorderFactory.createTitledBorder(null, "", TitledBorder.LEADING, TitledBorder.TOP, new Font("Arial", Font.BOLD, 12), new Color(0, 0, 0))); FileTreeModel model = new FileTreeModel(root); jTree.setRootVisible(false); jTree.setModel(model); expandAll(jTree); public void expandAll(JTree tree) { int row = 0; while (row < tree.getRowCount()) { tree.expandRow(row); row++; } }

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• Wildcards vs. generic methods

  - by FredOverflow

  Is there any practical difference between the following approaches to print all elements in a range? public static void printA(Iterable<?> range) { for (Object o : range) { System.out.println(o); } } public static <T> void printB(Iterable<T> range) { for (T x : range) { System.out.println(x); } } Apparently, printB involves an additional checked cast to Object (see line 16), which seems rather stupid to me -- isn't everything an Object anyway? public static void printA(java.lang.Iterable); Code: 0: aload_0 1: invokeinterface #18, 1; //InterfaceMethod java/lang/Iterable.iterator:()Ljava/util/Iterator; 6: astore_2 7: goto 24 10: aload_2 11: invokeinterface #24, 1; //InterfaceMethod java/util/Iterator.next:()Ljava/lang/Object; 16: astore_1 17: getstatic #30; //Field java/lang/System.out:Ljava/io/PrintStream; 20: aload_1 21: invokevirtual #36; //Method java/io/PrintStream.println:(Ljava/lang/Object;)V 24: aload_2 25: invokeinterface #42, 1; //InterfaceMethod java/util/Iterator.hasNext:()Z 30: ifne 10 33: return public static void printB(java.lang.Iterable); Code: 0: aload_0 1: invokeinterface #18, 1; //InterfaceMethod java/lang/Iterable.iterator:()Ljava/util/Iterator; 6: astore_2 7: goto 27 10: aload_2 11: invokeinterface #24, 1; //InterfaceMethod java/util/Iterator.next:()Ljava/lang/Object; 16: checkcast #3; //class java/lang/Object 19: astore_1 20: getstatic #30; //Field java/lang/System.out:Ljava/io/PrintStream; 23: aload_1 24: invokevirtual #36; //Method java/io/PrintStream.println:(Ljava/lang/Object;)V 27: aload_2 28: invokeinterface #42, 1; //InterfaceMethod java/util/Iterator.hasNext:()Z 33: ifne 10 36: return

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• Java Constructor Style (Check parameters aren't null)

  - by Peter

  What are the best practices if you have a class which accepts some parameters but none of them are allowed to be null? The following is obvious but the exception is a little unspecific: public class SomeClass { public SomeClass(Object one, Object two) { if (one == null || two == null) { throw new IllegalArgumentException("Parameters can't be null"); } //... } } Here the exceptions let you know which parameter is null, but the constructor is now pretty ugly: public class SomeClass { public SomeClass(Object one, Object two) { if (one == null) { throw new IllegalArgumentException("one can't be null"); } if (two == null) { throw new IllegalArgumentException("two can't be null"); } //... } Here the constructor is neater, but now the constructor code isn't really in the constructor: public class SomeClass { public SomeClass(Object one, Object two) { setOne(one); setTwo(two); } public void setOne(Object one) { if (one == null) { throw new IllegalArgumentException("one can't be null"); } //... } public void setTwo(Object two) { if (two == null) { throw new IllegalArgumentException("two can't be null"); } //... } } Which of these styles is best? Or is there an alternative which is more widely accepted? Cheers, Pete

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• C++ Namespaces & templates question

  - by Kotti

  Hi! I have some functions that can be grouped together, but don't belong to some object / entity and therefore can't be treated as methods. So, basically in this situation I would create a new namespace and put the definitions in a header file, the implementation in cpp file. Also (if needed) I would create an anonymous namespace in that cpp file and put all additional functions that don't have to be exposed / included to my namespace's interface there. See the code below (probably not the best example and could be done better with another program architecture, but I just can't think of a better sample...) Sample code (header) namespace algorithm { void HandleCollision(Object* object1, Object* object2); } Sample code (cpp) #include "header" // Anonymous namespace that wraps // routines that are used inside 'algorithm' methods // but don't have to be exposed namespace { void RefractObject(Object* object1) { // Do something with that object // (...) } } namespace algorithm { void HandleCollision(Object* object1, Object* object2) { if (...) RefractObject(object1); } } So far so good. I guess this is a good way to manage my code, but I don't know what should I do if I have some template-based functions and want to do basically the same. If I'm using templates, I have to put all my code in the header file. Ok, but how should I conceal some implementation details then? Like, I want to hide RefractObject function from my interface, but I can't simply remove it's declaration (just because I have all my code in a header file)... The only approach I came up with was something like: Sample code (header) namespace algorithm { // Is still exposed as a part of interface! namespace impl { template <typename T> void RefractObject(T* object1) { // Do something with that object // (...) } } template <typename T, typename Y> void HandleCollision(T* object1, Y* object2) { impl::RefractObject(object1); // Another stuff } } Any ideas how to make this better in terms of code designing?

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• Can I have two names for the same variable?

  - by Roman

  The short version of the question: I do: x = y. Then I change x, and y is unchanged. What I want is to "bind" x and y in such a way that I change y whenever I change x. The extended version (with some details): I wrote a class ("first" class) which generates objects of another class ("second" class). In more details, every object of the second class has a name as a unique identifier. I call a static method of the first class with a name of the object from the second class. The first class checks if such an object was already generated (if it is present in the static HashMap of the first class). If it is already there, it is returned. If it is not yet there, it is created, added to the HashMap and returned. And then I have the following problem. At some stage of my program, I take an object with a specific name from the HashMap of the first class. I do something with this object (for example change values of some fields). But the object in the HashMap does not see these changes! So, in fact, I do not "take" an object from the HashMap, I "create a copy" of this object and this is what I would like to avoid.

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• Why does this code sample produce a memory leak?

  - by citronas

  In the university we were given the following code sample and we were being told, that there is a memory leak when running this code. The sample should demonstrate that this is a situation where the garbage collector can't work. As far as my object oriented programming goes, the only codeline able to create a memory leak would be items=Arrays.copyOf(items,2 * size+1); The documentation says, that the elements are copied. Does that mean the reference is copied (and therefore another entry on the heap is created) or the object itself is being copied? As far as I know, Object and therefore Object[] are implemented as a reference type. So assigning a new value to 'items' would allow the garbage collector to find that the old 'item' is no longer referenced and can therefore be collected. In my eyes, this the codesample does not produce a memory leak. Could somebody prove me wrong? =) import java.util.Arrays; public class Foo { private Object[] items; private int size=0; private static final int ISIZE=10; public Foo() { items= new Object[ISIZE]; } public void push(final Object o){ checkSize(); items[size++]=o; } public Object pop(){ if (size==0) throw new ///... return items[--size]; } private void checkSize(){ if (items.length==size){ items=Arrays.copyOf(items,2 * size+1); } } }

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• Need help extrapolating Java code

  - by Berlioz

  If anyone familiar with Rebecca Wirfs-Brock, she has a piece of Java code found in her book titled, Object Design: Roles, Responsibilities, and Collaborations. Here is the quote Applying Double Dispatch to a Specific Problem To implement the game Rock, Paper, Scissors we need to write code that determines whether one object “beats” another. The game has nine possible outcomes based on the three kinds of objects. The number of interactions is the cross product of the kinds of objects. Case or switch statements are often governed by the type of data that is being operated on. The object-oriented language equivalent is to base its actions on the class of some other object. In Java, it looks like this Here is the piece of Java code on page 16 ' import java.util.*; import java.lang.*; public class Rock { public static void main(String args[]) { } public static boolean beats(GameObject object) { if (object.getClass.getName().equals("Rock")) { result = false; } else if (object.getClass.getName().equals("Paper")) { result = false; } else if(object.getClass.getName().equals("Scissors")) { result = true; } return result; } }' ===This is not a very good solution. First, the receiver needs to know too much about the argument. Second, there is one of these nested conditional statements in each of the three classes. If new kinds of objects could be added to the game, each of the three classes would have to be modified. Can anyone share with me how to get this "less than optimal" piece of code to work in order to see it 'working'. She proceeds to demonstrate a better way, but I will spare you. Thanks

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• Can JMX operations take interfaces as parameters?

  - by Thor84no

  I'm having problems with an MBean that takes a Map<String, Object> as a parameter. If I try to execute it via JMX using a proxy object, I get an Exception: Caused by: javax.management.ReflectionException at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:231) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) Caused by: java.lang.IllegalArgumentException: Unable to find operation updateProperties(java.util.HashMap) It appears that it attempts to use the actual implementation class rather than the interface, and doesn't check if this is a child of the required interface. The same thing happens for extended classes (for example declare HashMap, pass in LinkedHashMap). Does this mean it's impossible to use an interface for such methods? At the moment I'm getting around it by changing the method signature to accept a HashMap, but it seems odd that I wouldn't be able to use interfaces (or extended classes) in my MBeans. Edit: The proxy object is being created by an in-house utility class called JmxInvocationHandler. The (hopefully) relevant parts of it are as follows: public class JmxInvocationHandler implements InvocationHandler { ... public static <T> T createMBean(final Class<T> iface, SFSTestProperties properties, String mbean, int shHostID) { T newProxyInstance = (T) Proxy.newProxyInstance(iface.getClassLoader(), new Class[] { iface }, (InvocationHandler) new JmxInvocationHandler(properties, mbean, shHostID)); return newProxyInstance; } ... private JmxInvocationHandler(SFSTestProperties properties, String mbean, int shHostID) { this.mbeanName = mbean + MBEAN_SUFFIX + shHostID; msConfig = new MsConfiguration(properties.getHost(0), properties.getMSAdminPort(), properties.getMSUser(), properties.getMSPassword()); } ... public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { if (management == null) { management = ManagementClientStore.getInstance().getManagementClient(msConfig.getHost(), msConfig.getAdminPort(), msConfig.getUser(), msConfig.getPassword(), false); } final Object result = management.methodCall(mbeanName, method.getName(), args == null? new Object[] {} : args); return result; } }

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• Concept: Information Into Memory Location.

  - by Richeve S. Bebedor

  I am having troubles conceptualizing an algorithm to be used to transform any information or data into a specific appropriate and reasonable memory location in any data structure that I will be devising. To give you an idea, I have a JPanel object instance and I created another Container type object instance of any subtype (note this is in Java because I love this language), then I collected those instances into a data structure not specifically just for those instances but also applicable to any type of object. Now my procedure for fetching those data again is to extract the object specific features similar in category to all object in that data structure and transform it into a integer data memory location (specifically as much as possible) or any type of data that will pertain to this transformation. And I can already access that memory location without further sorting or applications of O(n) time complex algorithms (which I think preferable but I wanted to do my own way XD). The data structure is of any type either binary tree, linked list, arrays or sets (and the like XD). What is important is I don't need to have successive comparing and analysis of data just to locate information in big structures. To give you a technical idea, I have to an array DS that contains JLabel object instance with a specific name "HelloWorld". But array DS contains other types of object (in multitude). Now this JLabel object has a location in the array at index [124324] (which is if you do any type of searching algorithm just to arrive at that location is conceivably slow because added to it the data structure used was an array *note please disregard the efficiency of the data structure to be used I just want to explain to you my concept XD). Now I want to equate "HelloWorld" to 124324 by using a conceptually made function applicable to all data types. So that I can do a direct search by doing this DS[extractLocation("HelloWorld")] just to get that JLabel instance. I know this may sound crazy but I want to test my concept of non-sorting feature extracting search algorithm for any data structure wherein my main problem is how to transform information to be stored into memory location of where it was stored.

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• Create and define Vector

  - by zdmytriv

  I'm looking for method to create Vector and push some values without defining variable Vector. For example: I have function: public function bla(data:Vector.<Object>):void { ... } this function expects Vector as parameter. I can pass parameters this way var newVector:Vector.<Object> = new Vector.<Object>(); newVector.push("bla1"); newVector.push("bla2"); bla(newVector); Can I do it in one line in Flex? I'm looking for something like: bla(new Vector.<Object>().push("bla1").push("bla2")); I've also tried this: bla(function():Vector.<Object> { var result:Vector.<Object> = new Vector.<Object>(2, true); result.push("bla1"); result.push("bla2"); return result; }); But it complains: 1067: Implicit coercion of a value of type Function to an unrelated type __AS3__.vec:Vector.<Object>... Thanks

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• Strange behavior when overloading methods in Java

  - by Sep

  I came across this weird (in my opinion) behavior today. Take this simple Test class: public class Test { public static void main(String[] args) { Test t = new Test(); t.run(); } private void run() { List<Object> list = new ArrayList<Object>(); list.add(new Object()); list.add(new Object()); method(list); } public void method(Object o) { System.out.println("Object"); } public void method(List<Object> o) { System.out.println("List of Objects"); } } It behaves the way you expect, printing "List of Objects". But if you change the following three lines: List<String> list = new ArrayList<String>(); list.add(""); list.add(""); you will get "Object" instead. I tried this a few other ways and got the same result. Is this a bug or is it a normal behavior? And if it is normal, can someone explain why? Thanks.

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• QoS basics on a Cisco ASA

  - by qbn

  Could someone briefly explain how to use QoS on Cisco ASA 5505? I have the basics of policing down, but what about shaping and priorities? Basically what I'm trying to do is carve out some bandwidth for my VPN subnets (in an object-group called priority-traffic). I've seen this Cisco QoS document, however configuring shaping and priority-queue don't seem to have any effects in my test. A full download of the linux kernel from kernel.org will boost a ping to a server via VPN sky high. Policing has been successful in passing this test, although it doesn't seem as efficient (I cap non-vpn traffic at 3 of my 4.5 megabits of bandwidth). Am I misunderstanding the results of the test? I think there is some simple concept I'm not grasping here. EDIT: Here is my config thus far (I have 4.5 megabits of bandwidth): access-list priority-traffic extended permit ip object-group priority-traffic any access-list priority-traffic extended permit ip any object-group priority-traffic access-list priority-traffic extended permit icmp object-group priority-traffic any access-list priority-traffic extended permit icmp any object-group priority-traffic access-list non-priority-traffic extended deny ip object-group priority-traffic any access-list non-priority-traffic extended deny ip any object-group priority-traffic access-list non-priority-traffic extended permit ip any any priority-queue outside queue-limit 440 class-map non-priority-traffic match access-list non-priority-traffic class-map priority-traffic match access-list priority-traffic class-map inspection_default match default-inspection-traffic policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect rsh inspect rtsp inspect sqlnet inspect skinny inspect sunrpc inspect xdmcp inspect sip inspect netbios inspect tftp policy-map outbound-qos-policy class non-priority-traffic police input 2500000 police output 2500000 class priority-traffic priority service-policy global_policy global service-policy outbound-qos-policy interface outside

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• IntelliSense for Razor Hosting in non-Web Applications

  - by Rick Strahl

  When I posted my Razor Hosting article a couple of weeks ago I got a number of questions on how to get IntelliSense to work inside of Visual Studio while editing your templates. The answer to this question is mainly dependent on how Visual Studio recognizes assemblies, so a little background is required. If you open a template just on its own as a standalone file by clicking on it say in Explorer, Visual Studio will open up with the template in the editor, but you won’t get any IntelliSense on any of your related assemblies that you might be using by default. It’ll give Intellisense on base System namespace, but not on your imported assembly types. This makes sense: Visual Studio has no idea what the assembly associations for the single file are. There are two options available to you to make IntelliSense work for templates: Add the templates as included files to your non-Web project Add a BIN folder to your template’s folder and add all assemblies required there Including Templates in your Host Project By including templates into your Razor hosting project, Visual Studio will pick up the project’s assembly references and make IntelliSense available for any of the custom types in your project and on your templates. To see this work I moved the \Templates folder from the samples from the Debug\Bin folder into the project root and included the templates in the WinForm sample project. Here’s what this looks like in Visual Studio after the templates have been included:   Notice that I take my original example and type cast the Context object to the specific type that it actually represents – namely CustomContext – by using a simple code block: @{ CustomContext Model = Context as CustomContext; } After that assignment my Model local variable is in scope and IntelliSense works as expected. Note that you also will need to add any namespaces with the using command in this case: @using RazorHostingWinForm which has to be defined at the very top of a Razor document. BTW, while you can only pass in a single Context 'parameter’ to the template with the default template I’ve provided realize that you can also assign a complex object to Context. For example you could have a container object that references a variety of other objects which you can then cast to the appropriate types as needed: @{ ContextContainer container = Context as ContextContainer; CustomContext Model = container.Model; CustomDAO DAO = container.DAO; } and so forth. IntelliSense for your Custom Template Notice also that you can get IntelliSense for the top level template by specifying an inherits tag at the top of the document: @inherits RazorHosting.RazorTemplateFolderHost By specifying the above you can then get IntelliSense on your base template’s properties. For example, in my base template there are Request and Response objects. This is very useful especially if you end up creating custom templates that include your custom business objects as you can get effectively see full IntelliSense from the ‘page’ level down. For Html Help Builder for example, I’d have a Help object on the page and assuming I have the references available I can see all the way into that Help object without even having to do anything fancy. Note that the @inherits key is a GREAT and easy way to override the base template you normally specify as the default template. It allows you to create a custom template and as long as it inherits from the base template it’ll work properly. Since the last post I’ve also made some changes in the base template that allow hooking up some simple initialization logic so it gets much more easy to create custom templates and hook up custom objects with an IntializeTemplate() hook function that gets called with the Context and a Configuration object. These objects are objects you can pass in at runtime from your host application and then assign to custom properties on your template. For example the default implementation for RazorTemplateFolderHost does this: public override void InitializeTemplate(object context, object configurationData) { // Pick up configuration data and stuff into Request object RazorFolderHostTemplateConfiguration config = configurationData as RazorFolderHostTemplateConfiguration; this.Request.TemplatePath = config.TemplatePath; this.Request.TemplateRelativePath = config.TemplateRelativePath; // Just use the entire ConfigData as the model, but in theory // configData could contain many objects or values to set on // template properties this.Model = config.ConfigData as TModel; } to set up a strongly typed Model and the Request object. You can do much more complex hookups here of course and create complex base template pages that contain all the objects that you need in your code with strong typing. Adding a Bin folder to your Template’s Root Path Including templates in your host project works if you own the project and you’re the only one modifying the templates. However, if you are distributing the Razor engine as a templating/scripting solution as part of your application or development tool the original project is likely not available and so that approach is not practical. Another option you have is to add a Bin folder and add all the related assemblies into it. You can also add a Web.Config file with assembly references for any GAC’d assembly references that need to be associated with the templates. Between the web.config and bin folder Visual Studio can figure out how to provide IntelliSense. The Bin folder should contain: The RazorHosting.dll Your host project’s EXE or DLL – renamed to .dll if it’s an .exe Any external (bin folder) dependent assemblies Note that you most likely also want a reference to the host project if it contains references that are going to be used in templates. Visual Studio doesn’t recognize an EXE reference so you have to rename the EXE to DLL to make it work. Apparently the binary signature of EXE and DLL files are identical and it just works – learn something new everyday… For GAC assembly references you can add a web.config file to your template root. The Web.config file then should contain any full assembly references to GAC components: <configuration> <system.web> <compilation debug="true"> <assemblies> <add assembly="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> <add assembly="System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <add assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </assemblies> </compilation> </system.web> </configuration> And with that you should get full IntelliSense. Note that if you add a BIN folder and you also have the templates in your Visual Studio project Visual Studio will complain about reference conflicts as it’s effectively seeing both the project references and the ones in the bin folder. So it’s probably a good idea to use one or the other but not both at the same time :-) Seeing IntelliSense in your Razor templates is a big help for users of your templates. If you’re shipping an application level scripting solution especially it’ll be real useful for your template consumers/users to be able to get some quick help on creating customized templates – after all that’s what templates are all about – easy customization. Making sure that everything is referenced in your bin folder and web.config is a good idea and it’s great to see that Visual Studio (and presumably WebMatrix/Visual Web Developer as well) will be able to pick up your custom IntelliSense in Razor templates.© Rick Strahl, West Wind Technologies, 2005-2011Posted in Razor  

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• Checking who is connected to your server, with PowerShell.

  - by Fatherjack

  There are many occasions when, as a DBA, you want to see who is connected to your SQL Server, along with how they are connecting and what sort of activities they are carrying out. I’m going to look at a couple of ways of getting this information and compare the effort required and the results achieved of each. SQL Server comes with a couple of stored procedures to help with this sort of task – sp_who and its undocumented counterpart sp_who2. There is also the pumped up version of these called sp_whoisactive, written by Adam Machanic which does way more than these procedures. I wholly recommend you try it out if you don’t already know how it works. When it comes to serious interrogation of your SQL Server activity then it is absolutely indispensable. Anyway, back to the point of this blog, we are going to look at getting the information from sp_who2 for a remote server. I wrote this Powershell script a week or so ago and was quietly happy with it for a while. I’m relatively new to Powershell so forgive both my rather low threshold for entertainment and the fact that something so simple is a moderate achievement for me. $Server = 'SERVERNAME' $SMOServer = New-Object Microsoft.SQLServer.Management.SMO.Server $Server # connection and query stuff         $ConnectionStr = "Server=$Server;Database=Master;Integrated Security=True" $Query = "EXEC sp_who2" $Connection = new-object system.Data.SQLClient.SQLConnection $Table = new-object "System.Data.DataTable" $Connection.connectionstring = $ConnectionStr try{ $Connection.open() $Command = $Connection.CreateCommand() $Command.commandtext = $Query $result = $Command.ExecuteReader() $Table.Load($result) } catch{ # Show error $error[0] | format-list -Force } $Title = "Data access processes (" + $Table.Rows.Count + ")" $Table | Out-GridView -Title $Title $Connection.close() So this is pretty straightforward, create an SMO object that represents our chosen server, define a connection to the database and a table object for the results when we get them, execute our query over the connection, load the results into our table object and then, if everything is error free display these results to the PowerShell grid viewer. The query simply gets the results of ‘EXEC sp_who2′ for us. Depending on how many connections there are will influence how long the query runs. The grid viewer lets me sort and search the results so it can be a pretty handy way to locate troublesome connections. Like I say, I was quite pleased with this, it seems a pretty simple script and was working well for me, I have added a few parameters to control the output and give me more specific details but then I see a script that uses the $SMOServer object itself to provide the process information and saves having to define the connection object and query specifications. $Server = 'SERVERNAME' $SMOServer = New-Object Microsoft.SQLServer.Management.SMO.Server $Server $Processes = $SMOServer.EnumProcesses() $Title = "SMO processes (" + $Processes.Rows.Count + ")" $Processes | Out-GridView -Title $Title Create the SMO object of our server and then call the EnumProcesses method to get all the process information from the server. Staggeringly simple! The results are a little different though. Some columns are the same and we can see the same basic information so my first thought was to which runs faster – so that I can get my results more quickly and also so that I place less stress on my server(s). PowerShell comes with a great way of testing this – the Measure-Command function. All you have to do is wrap your piece of code in Measure-Command {[your code here]} and it will spit out the time taken to execute the code. So, I placed both of the above methods of getting SQL Server process connections in two Measure-Command wrappers and pressed F5! The Powershell console goes blank for a while as the code is executed internally when Measure-Command is used but the grid viewer windows appear and the console shows this. You can take the output from Measure-Command and format it for easier reading but in a simple comparison like this we can simply cross refer the TotalMilliseconds values from the two result sets to see how the two methods performed. The query execution method (running EXEC sp_who2 ) is the first set of timings and the SMO EnumProcesses is the second. I have run these on a variety of servers and while the results vary from execution to execution I have never seen the SMO version slower than the other. The difference has varied and the time for both has ranged from sub-second as we see above to almost 5 seconds on other systems. This difference, I would suggest is partly due to the cost overhead of having to construct the data connection and so on where as the SMO EnumProcesses method has the connection to the server already in place and just needs to call back the process information. There is also the difference in the data sets to consider. Let’s take a look at what we get and where the two methods differ Query execution method (sp_who2) SMO EnumProcesses Description - Urn What looks like an XML or JSON representation of the server name and the process ID SPID Spid The process ID Status Status The status of the process Login Login The login name of the user executing the command HostName Host The name of the computer where the  process originated BlkBy BlockingSpid The SPID of a process that is blocking this one DBName Database The database that this process is connected to Command Command The type of command that is executing CPUTime Cpu The CPU activity related to this process DiskIO - The Disk IO activity related to this process LastBatch - The time the last batch was executed from this process. ProgramName Program The application that is facilitating the process connection to the SQL Server. SPID1 - In my experience this is always the same value as SPID. REQUESTID - In my experience this is always 0 - Name In my experience this is always the same value as SPID and so could be seen as analogous to SPID1 from sp_who2 - MemUsage An indication of the memory used by this process but I don’t know what it is measured in (bytes, Kb, Mb…) - IsSystem True or False depending on whether the process is internal to the SQL Server instance or has been created by an external connection requesting data. - ExecutionContextID In my experience this is always 0 so could be analogous to REQUESTID from sp_who2. Please note, these are my own very brief descriptions of these columns, detail can be found from MSDN for columns in the sp_who results here http://msdn.microsoft.com/en-GB/library/ms174313.aspx. Where the columns are common then I would use that description, in other cases then the information returned is purely for interpretation by the reader. Rather annoyingly both result sets have useful information that the other doesn’t. sp_who2 returns Disk IO and LastBatch information which is really useful but the SMO processes method give you IsSystem and MemUsage which have their place in fault diagnosis methods too. So which is better? On reflection I think I prefer to use the sp_who2 method primarily but knowing that the SMO Enumprocesses method is there when I need it is really useful and I’m sure I’ll use it regularly. I’m OK with the fact that it is the slower method because Measure-Command has shown me how close it is to the other option and that it really isn’t a large enough margin to matter.

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• Why do we (really) program to interfaces?

  - by Kyle Burns

  One of the earliest lessons I was taught in Enterprise development was "always program against an interface".  This was back in the VB6 days and I quickly learned that no code would be allowed to move to the QA server unless my business objects and data access objects each are defined as an interface and have a matching implementation class.  Why?  "It's more reusable" was one answer.  "It doesn't tie you to a specific implementation" a slightly more knowing answer.  And let's not forget the discussion ending "it's a standard".  The problem with these responses was that senior people didn't really understand the reason we were doing the things we were doing and because of that, we were entirely unable to realize the intent behind the practice - we simply used interfaces and had a bunch of extra code to maintain to show for it. It wasn't until a few years later that I finally heard the term "Inversion of Control".  Simply put, "Inversion of Control" takes the creation of objects that used to be within the control (and therefore a responsibility of) of your component and moves it to some outside force.  For example, consider the following code which follows the old "always program against an interface" rule in the manner of many corporate development shops: 1: ICatalog catalog = new Catalog(); 2: Category[] categories = catalog.GetCategories(); In this example, I met the requirement of the rule by declaring the variable as ICatalog, but I didn't hit "it doesn't tie you to a specific implementation" because I explicitly created an instance of the concrete Catalog object.  If I want to test the functionality of the code I just wrote I have to have an environment in which Catalog can be created along with any of the resources upon which it depends (e.g. configuration files, database connections, etc) in order to test my functionality.  That's a lot of setup work and one of the things that I think ultimately discourages real buy-in of unit testing in many development shops. So how do I test my code without needing Catalog to work?  A very primitive approach I've seen is to change the line the instantiates catalog to read: 1: ICatalog catalog = new FakeCatalog();   once the test is run and passes, the code is switched back to the real thing.  This obviously poses a huge risk for introducing test code into production and in my opinion is worse than just keeping the dependency and its associated setup work.  Another popular approach is to make use of Factory methods which use an object whose "job" is to know how to obtain a valid instance of the object.  Using this approach, the code may look something like this: 1: ICatalog catalog = CatalogFactory.GetCatalog();   The code inside the factory is responsible for deciding "what kind" of catalog is needed.  This is a far better approach than the previous one, but it does make projects grow considerably because now in addition to the interface, the real implementation, and the fake implementation(s) for testing you have added a minimum of one factory (or at least a factory method) for each of your interfaces.  Once again, developers say "that's too complicated and has me writing a bunch of useless code" and quietly slip back into just creating a new Catalog and chalking any test failures up to "it will probably work on the server". This is where software intended specifically to facilitate Inversion of Control comes into play.  There are many libraries that take on the Inversion of Control responsibilities in .Net and most of them have many pros and cons.  From this point forward I'll discuss concepts from the standpoint of the Unity framework produced by Microsoft's Patterns and Practices team.  I'm primarily focusing on this library because it questions about it inspired this posting. At Unity's core and that of most any IoC framework is a catalog or registry of components.  This registry can be configured either through code or using the application's configuration file and in the most simple terms says "interface X maps to concrete implementation Y".  It can get much more complicated, but I want to keep things at the "what does it do" level instead of "how does it do it".  The object that exposes most of the Unity functionality is the UnityContainer.  This object exposes methods to configure the catalog as well as the Resolve<T> method which is used to obtain an instance of the type represented by T.  When using the Resolve<T> method, Unity does not necessarily have to just "new up" the requested object, but also can track dependencies of that object and ensure that the entire dependency chain is satisfied. There are three basic ways that I have seen Unity used within projects.  Those are through classes directly using the Unity container, classes requiring injection of dependencies, and classes making use of the Service Locator pattern. The first usage of Unity is when classes are aware of the Unity container and directly call its Resolve method whenever they need the services advertised by an interface.  The up side of this approach is that IoC is utilized, but the down side is that every class has to be aware that Unity is being used and tied directly to that implementation. Many developers don't like the idea of as close a tie to specific IoC implementation as is represented by using Unity within all of your classes and for the most part I agree that this isn't a good idea.  As an alternative, classes can be designed for Dependency Injection.  Dependency Injection is where a force outside the class itself manipulates the object to provide implementations of the interfaces that the class needs to interact with the outside world.  This is typically done either through constructor injection where the object has a constructor that accepts an instance of each interface it requires or through property setters accepting the service providers.  When using dependency, I lean toward the use of constructor injection because I view the constructor as being a much better way to "discover" what is required for the instance to be ready for use.  During resolution, Unity looks for an injection constructor and will attempt to resolve instances of each interface required by the constructor, throwing an exception of unable to meet the advertised needs of the class.  The up side of this approach is that the needs of the class are very clearly advertised and the class is unaware of which IoC container (if any) is being used.  The down side of this approach is that you're required to maintain the objects passed to the constructor as instance variables throughout the life of your object and that objects which coordinate with many external services require a lot of additional constructor arguments (this gets ugly and may indicate a need for refactoring). The final way that I've seen and used Unity is to make use of the ServiceLocator pattern, of which the Patterns and Practices team has also provided a Unity-compatible implementation.  When using the ServiceLocator, your class calls ServiceLocator.Retrieve in places where it would have called Resolve on the Unity container.  Like using Unity directly, it does tie you directly to the ServiceLocator implementation and makes your code aware that dependency injection is taking place, but it does have the up side of giving you the freedom to swap out the underlying IoC container if necessary.  I'm not hugely concerned with hiding IoC entirely from the class (I view this as a "nice to have"), so the single biggest problem that I see with the ServiceLocator approach is that it provides no way to proactively advertise needs in the way that constructor injection does, allowing more opportunity for difficult to track runtime errors. This blog entry has not been intended in any way to be a definitive work on IoC, but rather as something to spur thought about why we program to interfaces and some ways to reach the intended value of the practice instead of having it just complicate your code.  I hope that it helps somebody begin or continue a journey away from being a "Cargo Cult Programmer".

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• Delphi Indy IDHTTP question

  - by user327175

  I am trying to get the captcha image from a AOL, and i keep getting an error 418. unit imageunit; /// /// h t t p s://new.aol.com/productsweb/ /// interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, IdIOHandler, IdIOHandlerSocket, IdIOHandlerStack, IdSSL, IdSSLOpenSSL, IdIntercept, IdZLibCompressorBase, IdCompressorZLib, IdCookieManager, IdBaseComponent, IdComponent, IdTCPConnection, IdTCPClient, IdHTTP,jpeg,GIFImg, ExtCtrls; type TForm2 = class(TForm) IdHTTP1: TIdHTTP; IdCookieManager1: TIdCookieManager; IdCompressorZLib1: TIdCompressorZLib; IdConnectionIntercept1: TIdConnectionIntercept; IdSSLIOHandlerSocketOpenSSL1: TIdSSLIOHandlerSocketOpenSSL; Panel1: TPanel; Image1: TImage; Panel2: TPanel; Button1: TButton; Edit1: TEdit; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form2: TForm2; implementation {$R *.dfm} procedure TForm2.Button1Click(Sender: TObject); var JPI : TJPEGImage; streamdata:TMemoryStream; begin streamdata := TMemoryStream.Create; try idhttp1.Get(edit1.Text, Streamdata); Except { Handle exceptions } On E : Exception Do Begin MessageDlg('Exception: '+E.Message,mtError, [mbOK], 0); End; End; //h t t p s://new.aol.com/productsweb/WordVerImage?20890843 //h t t p s://new.aol.com/productsweb/WordVerImage?91868359 /// /// gives error 418 unused /// streamdata.Position := 0; JPI := TJPEGImage.Create; Try JPI.LoadFromStream ( streamdata ); Finally Image1.Picture.Assign ( JPI ); JPI.Free; streamdata.Free; End; end; end. Form: object Form2: TForm2 Left = 0 Top = 0 Caption = 'Form2' ClientHeight = 247 ClientWidth = 480 Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'Tahoma' Font.Style = [] OldCreateOrder = False PixelsPerInch = 96 TextHeight = 13 object Panel1: TPanel Left = 0 Top = 41 Width = 480 Height = 206 Align = alClient TabOrder = 0 ExplicitLeft = -8 ExplicitTop = 206 ExplicitHeight = 41 object Image1: TImage Left = 1 Top = 1 Width = 478 Height = 204 Align = alClient ExplicitLeft = 5 ExplicitTop = 17 ExplicitWidth = 200 ExplicitHeight = 70 end end object Panel2: TPanel Left = 0 Top = 0 Width = 480 Height = 41 Align = alTop TabOrder = 1 ExplicitLeft = 40 ExplicitTop = 32 ExplicitWidth = 185 object Button1: TButton Left = 239 Top = 6 Width = 75 Height = 25 Caption = 'Button1' TabOrder = 0 OnClick = Button1Click end object Edit1: TEdit Left = 16 Top = 8 Width = 217 Height = 21 TabOrder = 1 end end object IdHTTP1: TIdHTTP Intercept = IdConnectionIntercept1 IOHandler = IdSSLIOHandlerSocketOpenSSL1 MaxAuthRetries = 100 AllowCookies = True HandleRedirects = True RedirectMaximum = 100 ProxyParams.BasicAuthentication = False ProxyParams.ProxyPort = 0 Request.ContentLength = -1 Request.Accept = 'image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-s' + 'hockwave-flash, application/cade, application/xaml+xml, applicat' + 'ion/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-' + 'application, /' Request.BasicAuthentication = False Request.Referer = 'http://www.yahoo.com' Request.UserAgent = 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.1) Gecko/201001' + '22 firefox/3.6.1' HTTPOptions = [hoForceEncodeParams] CookieManager = IdCookieManager1 Compressor = IdCompressorZLib1 Left = 240 Top = 80 end object IdCookieManager1: TIdCookieManager Left = 360 Top = 136 end object IdCompressorZLib1: TIdCompressorZLib Left = 368 Top = 16 end object IdConnectionIntercept1: TIdConnectionIntercept Left = 304 Top = 72 end object IdSSLIOHandlerSocketOpenSSL1: TIdSSLIOHandlerSocketOpenSSL Intercept = IdConnectionIntercept1 MaxLineAction = maException Port = 0 DefaultPort = 0 SSLOptions.Mode = sslmUnassigned SSLOptions.VerifyMode = [] SSLOptions.VerifyDepth = 0 Left = 192 Top = 136 end end If you go to: h t t p s://new.aol.com/productsweb/ you will notice the captcha image has a url like: h t t p s://new.aol.com/productsweb/WordVerImage?91868359 I put that url in the edit box and get an error. What is wrong with this code.

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• Silverlight Recruiting Application Part 6 - Adding an Interview Scheduling Module/View

  Between the last post and this one I went ahead and carried the ideas for the Jobs module and view into the Applicants module and view- they're both doing more or less the same thing, except with different objects being at their core.  Made for an easy cut-and-paste operation with a few items being switched from one to another.  Now that we have the ability to add postings and applicants, wouldn't it be nice if we could schedule an interview?  Of course it would! Scheduling Module I think you get the drift from previous posts that these project structures start looking somewhat similar.  The interview scheduling module is no different than the rest- it gets a SchedulingModule.cs file at the root that inherits from IModule, and there is a single SchedulerView.xsml and SchedulerViewModel.cs setup for our V+VM.  We have one unique concern as we enter into this- RadScheduler deals with AppointmentsSource, not ItemsSource, so there are some special considerations to take into account when planning this module. First, I need something which inherits from AppointmentBase.  This is the core of the RadScheduler appointment, and if you are planning to do any form of custom appointment, you'll want it to inherit from this.  Then you can add-on functionality as needed.  Here is my addition to the mix, the InterviewAppointment: 01.public class InterviewAppointment : AppointmentBase 02.{ 03.    private int _applicantID; 04.    public int ApplicantID 05.    { 06.        get { return this._applicantID; } 07.        set 08.        { 09.            if (_applicantID != value) 10.            { 11.                _applicantID = value; 12.                OnPropertyChanged("ApplicantID"); 13.            } 14.        } 15.    } 16.   17.    private int _postingID; 18.    public int PostingID 19.    { 20.        get { return _postingID; } 21.        set 22.        { 23.            if (_postingID != value) 24.            { 25.                _postingID = value; 26.                OnPropertyChanged("PostingID"); 27.            } 28.        } 29.    } 30.   31.    private string _body; 32.    public string Body 33.    { 34.        get { return _body; } 35.        set 36.        { 37.            if (_body != value) 38.            { 39.                _body = value; 40.                OnPropertyChanged("Body"); 41.            } 42.        } 43.    } 44.   45.    private int _interviewID; 46.    public int InterviewID 47.    { 48.        get { return _interviewID; } 49.        set 50.        { 51.            if (_interviewID != value) 52.            { 53.                _interviewID = value; 54.                OnPropertyChanged("InterviewID"); 55.            } 56.        } 57.    } 58.   59.    public override IAppointment Copy() 60.    { 61.        IAppointment appointment = new InterviewAppointment(); 62.        appointment.CopyFrom(this);             63.        return appointment; 64.    } 65.   66.    public override void CopyFrom(IAppointment other) 67.    {             68.        base.CopyFrom(other); 69.        var appointment = other as InterviewAppointment; 70.        if (appointment != null) 71.        { 72.            ApplicantID = appointment.ApplicantID; 73.            PostingID = appointment.PostingID; 74.            Body = appointment.Body; 75.            InterviewID = appointment.InterviewID; 76.        } 77.    } 78.} Nothing too exciting going on here, we just make sure that our custom fields are persisted (specifically set in CopyFrom at the bottom) and notifications are fired- otherwise this ends up exactly like the standard appointment as far as interactions, etc.  But if we've got custom appointment items... that also means we need to customize what our appointment dialog window will look like. Customizing the Edit Appointment Dialog This initially sounds a lot more intimidating than it really is.  The first step here depends on what you're dealing with for theming, but for ease of everything I went ahead and extracted my templates in Blend for RadScheduler so I could modify it as I pleased.  For the faint of heart, the RadScheduler template is a few thousand lines of goodness since there are some very complex things going on in that control.  I've gone ahead and trimmed down the template parts I don't need as much as possible, so what is left is all that is relevant to the Edit Appointment Dialog.  Here's the resulting Xaml, with line numbers, so I can explain further: 001.<UserControl.Resources> 002.    <!-- begin Necessary Windows 7 Theme Resources for EditAppointmentTemplate --> 003.    <helpers:DataContextProxy x:Key="DataContextProxy" /> 004.       005.    <telerik:Windows7Theme x:Key="Theme" /> 006.    <SolidColorBrush x:Key="DialogWindowBackground" 007.                     Color="White" /> 008.    <SolidColorBrush x:Key="CategorySelectorBorderBrush" 009.                     Color="#FFB1B1B1" /> 010.    <LinearGradientBrush x:Key="RadToolBar_InnerBackground" 011.                         EndPoint="0.5,1" 012.                         StartPoint="0.5,0"> 013.        <GradientStop Color="#FFFDFEFF" 014.                      Offset="0" /> 015.        <GradientStop Color="#FFDDE9F7" 016.                      Offset="1" /> 017.        <GradientStop Color="#FFE6F0FA" 018.                      Offset="0.5" /> 019.        <GradientStop Color="#FFDCE6F4" 020.                      Offset="0.5" /> 021.    </LinearGradientBrush> 022.    <Style x:Key="FormElementTextBlockStyle" 023.           TargetType="TextBlock"> 024.        <Setter Property="HorizontalAlignment" 025.                Value="Right" /> 026.        <Setter Property="VerticalAlignment" 027.                Value="Top" /> 028.        <Setter Property="Margin" 029.                Value="15, 15, 0, 2" /> 030.    </Style> 031.    <Style x:Key="FormElementStyle" 032.           TargetType="FrameworkElement"> 033.        <Setter Property="Margin" 034.                Value="10, 10, 0, 2" /> 035.    </Style> 036.    <SolidColorBrush x:Key="GenericShallowBorderBrush" 037.                     Color="#FF979994" /> 038.    <telerik:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" /> 039.    <telerikScheduler:ImportanceToBooleanConverter x:Key="ImportanceToBooleanConverter" /> 040.    <telerikScheduler:NullToVisibilityConverter x:Key="NullToVisibilityConverter" /> 041.    <telerikScheduler:InvertedNullToVisibilityConverter x:Key="InvertedNullToVisibilityConverter" /> 042.    <scheduler:ResourcesSeparatorConverter x:Key="ResourcesSeparatorConverter" /> 043.    <DataTemplate x:Key="IconDataEditTemplate"> 044.        <Image Source="/Telerik.Windows.Controls.Scheduler;component/Themes/Office/Images/cal.png" 045.               Margin="3,3,0,0" 046.               Width="16" 047.               Height="16" /> 048.    </DataTemplate> 049.    <DataTemplate x:Key="SingleSelectionTemplate"> 050.        <Grid VerticalAlignment="Stretch" 051.              HorizontalAlignment="Stretch"> 052.            <Grid.RowDefinitions> 053.                <RowDefinition Height="Auto" /> 054.            </Grid.RowDefinitions> 055.            <Grid.ColumnDefinitions> 056.                <ColumnDefinition Width="Auto" 057.                                  MinWidth="84" /> 058.                <ColumnDefinition Width="Auto" 059.                                  MinWidth="200" /> 060.            </Grid.ColumnDefinitions> 061.            <TextBlock x:Name="SelectionNameLabel" 062.                       Margin="0,13,4,2" 063.                       Text="{Binding ResourceType.DisplayName}" 064.                       Style="{StaticResource FormElementTextBlockStyle}" 065.                       Grid.Column="0" /> 066.            <telerikInput:RadComboBox ItemsSource="{Binding ResourceItems}" 067.                                      Width="185" 068.                                      Margin="5,10,20,2" 069.                                      HorizontalAlignment="Left" 070.                                      Grid.Column="1" 071.                                      ClearSelectionButtonVisibility="Visible" 072.                                      ClearSelectionButtonContent="Clear All" 073.                                      DisplayMemberPath="Resource.DisplayName" 074.                                      telerik:StyleManager.Theme="{StaticResource Theme}" 075.                                      SelectedItem="{Binding SelectedItem, Mode=TwoWay}" /> 076.        </Grid> 077.    </DataTemplate> 078.    <DataTemplate x:Key="MultipleSelectionTemplate"> 079.        <Grid VerticalAlignment="Stretch" 080.              HorizontalAlignment="Stretch"> 081.            <Grid.RowDefinitions> 082.                <RowDefinition Height="Auto" /> 083.            </Grid.RowDefinitions> 084.            <Grid.ColumnDefinitions> 085.                <ColumnDefinition Width="Auto" 086.                                  MinWidth="84" /> 087.                <ColumnDefinition Width="Auto" 088.                                  MinWidth="200" /> 089.            </Grid.ColumnDefinitions> 090.            <TextBlock x:Name="SelectionNameLabel" 091.                       Grid.Column="0" 092.                       Text="{Binding ResourceType.DisplayName}" 093.                       Margin="0,13,4,2" 094.                       Style="{StaticResource FormElementTextBlockStyle}" /> 095.            <telerikInput:RadComboBox Grid.Column="1" 096.                                      Width="185" 097.                                      HorizontalAlignment="Left" 098.                                      Margin="5,10,20,2" 099.                                      ItemsSource="{Binding ResourceItems}" 100.                                      SelectedIndex="{Binding SelectedIndex, Mode=TwoWay}" 101.                                      ClearSelectionButtonVisibility="Visible" 102.                                      ClearSelectionButtonContent="Clear All" 103.                                      telerik:StyleManager.Theme="{StaticResource Theme}"> 104.                <telerikInput:RadComboBox.ItemTemplate> 105.                    <DataTemplate> 106.                        <Grid HorizontalAlignment="Stretch" 107.                              VerticalAlignment="Stretch"> 108.                            <CheckBox VerticalAlignment="Center" 109.                                      HorizontalContentAlignment="Stretch" 110.                                      VerticalContentAlignment="Center" 111.                                      IsChecked="{Binding IsChecked, Mode=TwoWay}" 112.                                      Content="{Binding Resource.DisplayName}"> 113.                                <CheckBox.ContentTemplate> 114.                                    <DataTemplate> 115.                                        <TextBlock HorizontalAlignment="Stretch" 116.                                                   VerticalAlignment="Stretch" 117.                                                   Text="{Binding Content, RelativeSource={RelativeSource TemplatedParent}}" /> 118.                                    </DataTemplate> 119.                                </CheckBox.ContentTemplate> 120.                            </CheckBox> 121.                        </Grid> 122.                    </DataTemplate> 123.                </telerikInput:RadComboBox.ItemTemplate> 124.            </telerikInput:RadComboBox> 125.        </Grid> 126.    </DataTemplate> 127.    <scheduler:ResourceTypeTemplateSelector x:Key="ItemTemplateSelector" 128.                                            MultipleSelectionTemplate="{StaticResource MultipleSelectionTemplate}" 129.                                            SingleSelectionTemplate="{StaticResource SingleSelectionTemplate}" /> 130.    <!-- end Necessary Windows 7 Theme Resources for EditAppointmentTemplate -->  131.       132.    <ControlTemplate x:Key="EditAppointmentTemplate" 133.                     TargetType="telerikScheduler:AppointmentDialogWindow"> 134.        <StackPanel Background="{TemplateBinding Background}" 135.                    UseLayoutRounding="True"> 136.            <StackPanel Grid.Row="0" 137.                        Orientation="Horizontal" 138.                        Background="{StaticResource RadToolBar_InnerBackground}" 139.                        Grid.ColumnSpan="2" 140.                        Height="0"> 141.                <!-- Recurrence buttons --> 142.                <Border Margin="1,1,0,0" 143.                        Background="#50000000" 144.                        HorizontalAlignment="Left" 145.                        VerticalAlignment="Center" 146.                        Width="2" 147.                        Height="16"> 148.                    <Border Margin="0,0,1,1" 149.                            Background="#80FFFFFF" 150.                            HorizontalAlignment="Left" 151.                            Width="1" /> 152.                </Border> 153.                <Border Margin="1,1,0,0" 154.                        Background="#50000000" 155.                        HorizontalAlignment="Left" 156.                        VerticalAlignment="Center" 157.                        Width="2" 158.                        Height="16"> 159.                    <Border Margin="0,0,1,1" 160.                            Background="#80FFFFFF" 161.                            HorizontalAlignment="Left" 162.                            Width="1" /> 163.                </Border> 164.                <TextBlock telerik:LocalizationManager.ResourceKey="ShowAs" 165.                           VerticalAlignment="Center" 166.                           Margin="5,0,0,0" /> 167.                <telerikInput:RadComboBox ItemsSource="{TemplateBinding TimeMarkers}" 168.                                          Width="100" 169.                                          Height="20" 170.                                          VerticalAlignment="Center" 171.                                          Margin="5,0,0,0" 172.                                          ClearSelectionButtonVisibility="Visible" 173.                                          ClearSelectionButtonContent="Clear" 174.                                          SelectedItem="{Binding TimeMarker,RelativeSource={RelativeSource TemplatedParent},Mode=TwoWay}" 175.                                          telerik:StyleManager.Theme="{StaticResource Theme}"> 176.                    <telerikInput:RadComboBox.ItemTemplate> 177.                        <DataTemplate> 178.                            <StackPanel Orientation="Horizontal"> 179.                                <Rectangle Fill="{Binding TimeMarkerBrush}" 180.                                           Margin="2" 181.                                           Width="12" 182.                                           Height="12" /> 183.                                <TextBlock Text="{Binding TimeMarkerName}" 184.                                           Margin="2" /> 185.                            </StackPanel> 186.                        </DataTemplate> 187.                    </telerikInput:RadComboBox.ItemTemplate> 188.                </telerikInput:RadComboBox> 189.                <telerik:RadToggleButton x:Name="High" 190.                                         BorderThickness="0" 191.                                         Background="{StaticResource RadToolBar_InnerBackground}" 192.                                         DataContext="{TemplateBinding EditedAppointment}" 193.                                         telerik:StyleManager.Theme="{StaticResource Theme}" 194.                                         IsChecked="{Binding Importance,Mode=TwoWay, Converter={StaticResource ImportanceToBooleanConverter},ConverterParameter=High}" 195.                                         Margin="2,2,0,2" 196.                                         Width="23" 197.                                         Height="23" 198.                                         HorizontalContentAlignment="Center" 199.                                         ToolTipService.ToolTip="High importance" 200.                                         CommandParameter="High" 201.                                         Command="telerikScheduler:RadSchedulerCommands.SetAppointmentImportance"> 202.                    <StackPanel HorizontalAlignment="Center"> 203.                        <Path Stretch="Fill" 204.                              Height="10" 205.                              HorizontalAlignment="Center" 206.                              VerticalAlignment="Top" 207.                              Width="5.451" 208.                              Data="M200.39647,58.840393 C200.39337,58.336426 201.14566,57.683922 202.56244,57.684292 C204.06589,57.684685 204.73764,58.357765 204.72783,58.992363 C205.04649,61.795574 203.04713,64.181099 202.47388,66.133446 C201.93753,64.154961 199.9471,61.560352 200.39647,58.840393 z"> 209.                            <Path.Fill> 210.                                <LinearGradientBrush EndPoint="1.059,0.375" 211.                                                     StartPoint="-0.457,0.519"> 212.                                    <GradientStop Color="#FFFF0606" 213.                                                  Offset="0.609" /> 214.                                    <GradientStop Color="#FFBF0303" 215.                                                  Offset="0.927" /> 216.                                </LinearGradientBrush> 217.                            </Path.Fill> 218.                        </Path> 219.                        <Ellipse Height="3" 220.                                 HorizontalAlignment="Center" 221.                                 Margin="0,-1,0,0" 222.                                 VerticalAlignment="Top" 223.                                 Width="3"> 224.                            <Ellipse.Fill> 225.                                <RadialGradientBrush> 226.                                    <GradientStop Color="#FFFF0606" 227.                                                  Offset="0" /> 228.                                    <GradientStop Color="#FFBF0303" 229.                                                  Offset="1" /> 230.                                </RadialGradientBrush> 231.                            </Ellipse.Fill> 232.                        </Ellipse> 233.                    </StackPanel> 234.                </telerik:RadToggleButton> 235.                <telerik:RadToggleButton x:Name="Low" 236.                                         HorizontalContentAlignment="Center" 237.                                         BorderThickness="0" 238.                                         Background="{StaticResource RadToolBar_InnerBackground}" 239.                                         DataContext="{TemplateBinding EditedAppointment}" 240.                                         IsChecked="{Binding Importance,Mode=TwoWay, Converter={StaticResource ImportanceToBooleanConverter},ConverterParameter=Low}" 241.                                         Margin="0,2,0,2" 242.                                         Width="23" 243.                                         Height="23" 244.                                         ToolTipService.ToolTip="Low importance" 245.                                         CommandParameter="Low" 246.                                         telerik:StyleManager.Theme="{StaticResource Theme}" 247.                                         Command="telerikScheduler:RadSchedulerCommands.SetAppointmentImportance"> 248.                    <Path Stretch="Fill" 249.                          Height="12" 250.                          HorizontalAlignment="Center" 251.                          VerticalAlignment="Top" 252.                          Width="9" 253.                          Data="M222.40353,60.139881 L226.65768,60.139843 L226.63687,67.240196 L229.15347,67.240196 L224.37816,71.394943 L219.65274,67.240196 L222.37572,67.219345 z" 254.                          Stroke="#FF0365A7"> 255.                        <Path.Fill> 256.                            <LinearGradientBrush EndPoint="1.059,0.375" 257.                                                 StartPoint="-0.457,0.519"> 258.                                <GradientStop Color="#FFBBE4FF" /> 259.                                <GradientStop Color="#FF024572" 260.                                              Offset="0.836" /> 261.                                <GradientStop Color="#FF43ADF4" 262.                                              Offset="0.466" /> 263.                            </LinearGradientBrush> 264.                        </Path.Fill> 265.                    </Path> 266.                </telerik:RadToggleButton> 267.            </StackPanel > 268.            <Border DataContext="{TemplateBinding EditedAppointment}" 269.                    Background="{Binding Category.CategoryBrush}" 270.                    Visibility="{Binding Category,Converter={StaticResource NullToVisibilityConverter}}" 271.                    CornerRadius="3" 272.                    Height="20" 273.                    Margin="5,10,5,0"> 274.                <TextBlock Text="{Binding Category.DisplayName}" 275.                           VerticalAlignment="Center" 276.                           Margin="5,0,0,0" /> 277.            </Border> 278.            <Grid VerticalAlignment="Stretch" 279.                  HorizontalAlignment="Stretch" 280.                  DataContext="{TemplateBinding EditedAppointment}" 281.                  Background="{TemplateBinding Background}"> 282.                <Grid.RowDefinitions> 283.                    <RowDefinition Height="Auto" /> 284.                    <RowDefinition Height="Auto" /> 285.                    <RowDefinition Height="Auto" /> 286.                    <RowDefinition Height="Auto" /> 287.                    <RowDefinition Height="Auto" /> 288.                    <RowDefinition Height="Auto" /> 289.                    <RowDefinition Height="Auto" /> 290.                    <RowDefinition Height="Auto" /> 291.                    <RowDefinition Height="Auto" /> 292.                    <RowDefinition Height="Auto" /> 293.                </Grid.RowDefinitions> 294.                <Grid.ColumnDefinitions> 295.                    <ColumnDefinition Width="Auto" 296.                                      MinWidth="100" /> 297.                    <ColumnDefinition Width="Auto" 298.                                      MinWidth="200" /> 299.                </Grid.ColumnDefinitions> 300.                <!-- Subject --> 301.                <TextBlock x:Name="SubjectLabel" 302.                           Grid.Row="0" 303.                           Grid.Column="0" 304.                           Margin="0,15,0,2" 305.                           telerik:LocalizationManager.ResourceKey="Subject" 306.                           Style="{StaticResource FormElementTextBlockStyle}" /> 307.                <TextBox x:Name="Subject" 308.                         Grid.Row="0" 309.                         Grid.Column="1" 310.                         MinHeight="22" 311.                         Padding="4 2" 312.                         Width="340" 313.                         HorizontalAlignment="Left" 314.                         Text="{Binding Subject, Mode=TwoWay}" 315.                         MaxLength="255" 316.                         telerik:StyleManager.Theme="{StaticResource Theme}" 317.                         Margin="10,12,20,2" /> 318.                <!-- Description --> 319.                <TextBlock x:Name="DescriptionLabel" 320.                           Grid.Row="1" 321.                           Grid.Column="0" 322.                           Margin="0,13,0,2" 323.                           telerik:LocalizationManager.ResourceKey="Body" 324.                           Style="{StaticResource FormElementTextBlockStyle}" /> 325.                <TextBox x:Name="Body" 326.                         VerticalAlignment="top" 327.                         Grid.Row="1" 328.                         Grid.Column="1" 329.                         Height="Auto" 330.                         MaxHeight="82" 331.                         Width="340" 332.                         HorizontalAlignment="Left" 333.                         MinHeight="22" 334.                         Padding="4 2" 335.                         TextWrapping="Wrap" 336.                         telerik:StyleManager.Theme="{StaticResource Theme}" 337.                         Text="{Binding Body, Mode=TwoWay}" 338.                         AcceptsReturn="true" 339.                         Margin="10,10,20,2" 340.                         HorizontalScrollBarVisibility="Auto" 341.                         VerticalScrollBarVisibility="Auto" /> 342.                <!-- Start/End date --> 343.                <TextBlock x:Name="StartDateLabel" 344.                           Grid.Row="2" 345.                           Grid.Column="0" 346.                           Margin="0,13,0,2" 347.                           telerik:LocalizationManager.ResourceKey="StartTime" 348.                           Style="{StaticResource FormElementTextBlockStyle}" /> 349.                <telerikScheduler:DateTimePicker x:Name="StartDateTime" 350.                                                 Height="22" 351.                                                 Grid.Row="2" 352.                                                 Grid.Column="1" 353.                                                 HorizontalAlignment="Left" 354.                                                 Margin="10,10,20,2" 355.                                                 Style="{StaticResource FormElementStyle}" 356.                                                 SelectedDateTime="{Binding Start, Mode=TwoWay}" 357.                                                 telerikScheduler:StartEndDatePicker.EndPicker="{Binding ElementName=EndDateTime}" 358.                                                 IsTabStop="False" 359.                                                 IsEnabled="False" /> 360.                <TextBlock x:Name="EndDateLabel" 361.                           Grid.Row="3" 362.                           Grid.Column="0" 363.                           Margin="0,13,0,2" 364.                           telerik:LocalizationManager.ResourceKey="EndTime" 365.                           Style="{StaticResource FormElementTextBlockStyle}" /> 366.                <telerikScheduler:DateTimePicker x:Name="EndDateTime" 367.                                                 Height="22" 368.                                                 Grid.Row="3" 369.                                                 Grid.Column="1" 370.                                                 HorizontalAlignment="Left" 371.                                                 Margin="10,10,20,2" 372.                                                 Style="{StaticResource FormElementStyle}" 373.                                                 IsTabStop="False" 374.                                                 IsEnabled="False" 375.                                                 SelectedDateTime="{Binding End, Mode=TwoWay}" /> 376.                <!-- Is-all-day selector --> 377.                <CheckBox x:Name="AllDayEventCheckbox" 378.                          IsChecked="{Binding IsAllDayEvent, Mode=TwoWay}" 379.                          Grid.Row="4" 380.                          Grid.Column="1" 381.                          Margin="10,10,20,2" 382.                          HorizontalAlignment="Left" 383.                          telerik:StyleManager.Theme="{StaticResource Theme}" 384.                          telerik:LocalizationManager.ResourceKey="AllDayEvent"> 385.                    <telerik:CommandManager.InputBindings> 386.                        <telerik:InputBindingCollection> 387.                            <telerik:MouseBinding Command="telerikScheduler:RadSchedulerCommands.ChangeTimePickersVisibility" 388.                                                  Gesture="LeftClick" /> 389.                        </telerik:InputBindingCollection> 390.                    </telerik:CommandManager.InputBindings> 391.                </CheckBox> 392.                <Grid Grid.Row="5" 393.                      Grid.ColumnSpan="2"> 394.                    <Grid.ColumnDefinitions> 395.                        <ColumnDefinition Width="Auto" 396.                                          MinWidth="100" /> 397.                        <ColumnDefinition Width="Auto" 398.                                          MinWidth="200" /> 399.                    </Grid.ColumnDefinitions> 400.                    <Grid.RowDefinitions> 401.                        <RowDefinition Height="Auto" /> 402.                        <RowDefinition Height="Auto" /> 403.                    </Grid.RowDefinitions> 404.                    <TextBlock Text="Applicant" 405.                               Margin="0,13,0,2" 406.                               Style="{StaticResource FormElementTextBlockStyle}" /> 407.                    <telerikInput:RadComboBox IsEditable="False" 408.                                              Grid.Column="1" 409.                                              Height="24" 410.                                              VerticalAlignment="Center" 411.                                              ItemsSource="{Binding Source={StaticResource DataContextProxy}, Path=DataSource.ApplicantList}" 412.                                              SelectedValue="{Binding ApplicantID, Mode=TwoWay}" 413.                                              SelectedValuePath="ApplicantID" 414.                                              DisplayMemberPath="FirstName" /> 415.                       416.                    <TextBlock Text="Job" 417.                               Margin="0,13,0,2" 418.                               Grid.Row="1" 419.                               Style="{StaticResource FormElementTextBlockStyle}" /> 420.                    <telerikInput:RadComboBox IsEditable="False" 421.                                              Grid.Column="1" 422.                                              Grid.Row="1" 423.                                              Height="24" 424.                                              VerticalAlignment="Center" 425.                                              ItemsSource="{Binding Source={StaticResource DataContextProxy}, Path=DataSource.JobsList}" 426.                                              SelectedValue="{Binding PostingID, Mode=TwoWay}" 427.                                              SelectedValuePath="PostingID" 428.                                              DisplayMemberPath="JobTitle"/> 429.                </Grid> 430.                    <!-- Resources --> 431.                <Grid x:Name="ResourcesLayout" 432.                      Grid.Row="7" 433.                      Grid.Column="0" 434.                      Grid.ColumnSpan="2" 435.                      MaxHeight="130" 436.                      Margin="20,5,20,0"> 437.                    <Border Margin="0" 438.                            BorderThickness="1" 439.                            BorderBrush="{StaticResource GenericShallowBorderBrush}" 440.                            Visibility="{Binding ElementName=ResourcesScrollViewer, Path=ComputedVerticalScrollBarVisibility}"></Border> 441.                    <ScrollViewer x:Name="ResourcesScrollViewer" 442.                                  IsTabStop="false" 443.                                  Grid.Row="6" 444.                                  Grid.Column="0" 445.                                  Grid.ColumnSpan="2" 446.                                  Margin="1" 447.                                  telerik:StyleManager.Theme="{StaticResource Theme}" 448.                                  VerticalScrollBarVisibility="Auto"> 449.                        <scheduler:ResourcesItemsControl x:Name="PART_Resources" 450.                                                         HorizontalAlignment="Left" 451.                                                         Padding="0,2,0,5" 452.                                                         IsTabStop="false" 453.                                                         ItemsSource="{TemplateBinding ResourceTypeModels}" 454.                                                         ItemTemplateSelector="{StaticResource ItemTemplateSelector}" /> 455.                    </ScrollViewer> 456.                </Grid> 457.                <StackPanel x:Name="FooterControls" 458.                            Margin="5 10 10 10" 459.                            Grid.Row="8" 460.                            Grid.Column="1" 461.                            HorizontalAlignment="Left" 462.                            Orientation="Horizontal"> 463.                    <telerik:RadButton x:Name="OKButton" 464.                                       Margin="5" 465.                                       Padding="10 0" 466.                                       MinWidth="80" 467.                                       Command="telerikScheduler:RadSchedulerCommands.SaveAppointment" 468.                                       telerik:StyleManager.Theme="{StaticResource Theme}" 469.                                       telerikNavigation:RadWindow.ResponseButton="Accept" 470.                                       telerik:LocalizationManager.ResourceKey="SaveAndCloseCommandText"> 471.                    </telerik:RadButton> 472.                    <telerik:RadButton x:Name="CancelButton" 473.                                       Margin="5" 474.                                       Padding="10 0" 475.                                       MinWidth="80" 476.                                       telerik:LocalizationManager.ResourceKey="Cancel" 477.                                       telerik:StyleManager.Theme="{StaticResource Theme}" 478.                                       telerikNavigation:RadWindow.ResponseButton="Cancel" 479.                                       Command="telerik:WindowCommands.Close"> 480.                    </telerik:RadButton> 481.                </StackPanel> 482.            </Grid> 483.            <vsm:VisualStateManager.VisualStateGroups> 484.                <vsm:VisualStateGroup x:Name="RecurrenceRuleState"> 485.                    <vsm:VisualState x:Name="RecurrenceRuleIsNull"> 486.                        <Storyboard> 487.                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="StartDateTime" 488.                                                           Storyboard.TargetProperty="IsEnabled" 489.                                                           Duration="0"> 490.                                <DiscreteObjectKeyFrame KeyTime="0" 491.                                                        Value="True" /> 492.                            </ObjectAnimationUsingKeyFrames> 493.                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="EndDateTime" 494.                                                           Storyboard.TargetProperty="IsEnabled" 495.                                                           Duration="0"> 496.                                <DiscreteObjectKeyFrame KeyTime="0" 497.                                                        Value="True" /> 498.                            </ObjectAnimationUsingKeyFrames> 499.                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="AllDayEventCheckbox" 500.                                                           Storyboard.TargetProperty="IsEnabled" 501.                                                           Duration="0"> 502.                                <DiscreteObjectKeyFrame KeyTime="0" 503.                                                        Value="True" /> 504.                            </ObjectAnimationUsingKeyFrames> 505.                        </Storyboard> 506.                    </vsm:VisualState> 507.                    <vsm:VisualState x:Name="RecurrenceRuleIsNotNull"> 508.                        <Storyboard> 509.                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="StartDateTime" 510.                                                           Storyboard.TargetProperty="IsEnabled" 511.                                                           Duration="0"> 512.                                <DiscreteObjectKeyFrame KeyTime="0" 513.                                                        Value="False" /> 514.                            </ObjectAnimationUsingKeyFrames> 515.                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="EndDateTime" 516.                                                           Storyboard.TargetProperty="IsEnabled" 517.                                                           Duration="0"> 518.                                <DiscreteObjectKeyFrame KeyTime="0" 519.                                                        Value="False" /> 520.                            </ObjectAnimationUsingKeyFrames> 521.                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="AllDayEventCheckbox" 522.                                                           Storyboard.TargetProperty="IsEnabled" 523.                                                           Duration="0"> 524.                                <DiscreteObjectKeyFrame KeyTime="0" 525.                                                        Value="False" /> 526.                            </ObjectAnimationUsingKeyFrames> 527.                        </Storyboard> 528.                    </vsm:VisualState> 529.                </vsm:VisualStateGroup> 530.            </vsm:VisualStateManager.VisualStateGroups> 531.        </StackPanel> 532.    </ControlTemplate> 533.    <DataTemplate x:Key="AppointmentDialogWindowHeaderDataTemplate"> 534.        <StackPanel Orientation="Horizontal" 535.                    MaxWidth="400"> 536.            <TextBlock telerik:LocalizationManager.ResourceKey="Event" 537.                       Visibility="{Binding Appointment.IsAllDayEvent, Converter={StaticResource BooleanToVisibilityConverter}}" /> 538.            <TextBlock telerik:LocalizationManager.ResourceKey="Appointment" 539.                       Visibility="{Binding Appointment.IsAllDayEvent, Converter={StaticResource InvertedBooleanToVisibilityConverter}}" /> 540.            <TextBlock Text=" - " /> 541.            <TextBlock x:Name="SubjectTextBlock" 542.                       Visibility="{Binding Appointment.Subject, Converter={StaticResource NullToVisibilityConverter}}" 543.                       Text="{Binding Appointment.Subject}" /> 544.            <TextBlock telerik:LocalizationManager.ResourceKey="Untitled" 545.                       Visibility="{Binding Appointment.Subject, Converter={StaticResource InvertedNullToVisibilityConverter}}" /> 546.        </StackPanel> 547.    </DataTemplate> 548.    <Style x:Key="EditAppointmentStyle" 549.           TargetType="telerikScheduler:AppointmentDialogWindow"> 550.        <Setter Property="IconTemplate" 551.                Value="{StaticResource IconDataEditTemplate}" /> 552.        <Setter Property="HeaderTemplate" 553.                Value="{StaticResource AppointmentDialogWindowHeaderDataTemplate}" /> 554.        <Setter Property="Background" 555.                Value="{StaticResource DialogWindowBackground}" /> 556.        <Setter Property="Template" 557.                Value="{StaticResource EditAppointmentTemplate}" /> 558.    </Style> 559.</UserControl.Resources> The first line there is the DataContextProxy I mentioned previously- we use that again to work a bit of magic in this template. Where we start getting into the dialog in question is line 132, but line 407 is where things start getting interesting.  The ItemsSource is pointing at a list that exists in my ViewModel (or code-behind, if it is used as a DataContext), the SelectedValue is the item I am actually binding from the applicant (note the TwoWay binding), and SelectedValuePath and DisplayMemberPath ensure the proper applicant is being displayed from the collection.  You will also see similar starting on line 420 where I do the same for the Jobs we'll be displaying. Just to wrap-up the Xaml, here's the RadScheduler declaraction that ties this all together and will be the main focus of our view: 01.<telerikScheduler:RadScheduler x:Name="xJobsScheduler" 02.                  Grid.Row="1" 03.                  Grid.Column="1" 04.                  Width="800" 05.                  MinWidth="600" 06.                  Height="500" 07.                  MinHeight="300" 08.                  AppointmentsSource="{Binding Interviews}" 09.                  EditAppointmentStyle="{StaticResource EditAppointmentStyle}" 10.                  command:AppointmentAddedEventClass.Command="{Binding AddAppointmentCommand}" 11.                  command:ApptCreatedEventClass.Command="{Binding ApptCreatingCommand}" 12.                  command:ApptEditedEventClass.Command="{Binding ApptEditedCommand}" 13.                  command:ApptDeletedEventClass.Command="{Binding ApptDeletedCommand}"> 14.</telerikScheduler:RadScheduler> Now, we get to the ViewModel and what it takes to get that rigged up.  And for those of you who remember the jobs post, those command:s in the Xaml are pointing to attached behavior commands that reproduce the respective events.  This becomes very handy when we're setting up the code-behind version. ;) ViewModel I've been liking this approach so far, so I'm going to put the entire ViewModel here and then go into the lines of interest.  Of course, feel free to ask me questions about anything that isn't clear (by line number, ideally) so I can help out if I have missed anything important: 001.public class SchedulerViewModel : ViewModelBase 002.{ 003.    private readonly IEventAggregator eventAggregator; 004.    private readonly IRegionManager regionManager; 005.   006.    public RecruitingContext context; 007.   008.    private ObservableItemCollection<InterviewAppointment> _interviews = new ObservableItemCollection<InterviewAppointment>(); 009.    public ObservableItemCollection<InterviewAppointment> Interviews 010.    { 011.        get { return _interviews; } 012.        set 013.        { 014.            if (_interviews != value) 015.            { 016.                _interviews = value; 017.                NotifyChanged("Interviews"); 018.            } 019.        } 020.    } 021.   022.    private QueryableCollectionView _jobsList; 023.    public QueryableCollectionView JobsList 024.    { 025.        get { return this._jobsList; } 026.        set 027.        { 028.            if (this._jobsList != value) 029.            { 030.                this._jobsList = value; 031.                this.NotifyChanged("JobsList"); 032.            } 033.        } 034.    } 035.   036.    private QueryableCollectionView _applicantList; 037.    public QueryableCollectionView ApplicantList 038.    { 039.        get { return _applicantList; } 040.        set 041.        { 042.            if (_applicantList != value) 043.            { 044.                _applicantList = value; 045.                NotifyChanged("ApplicantList"); 046.            } 047.        } 048.    } 049.   050.    public DelegateCommand<object> AddAppointmentCommand { get; set; } 051.    public DelegateCommand<object> ApptCreatingCommand { get; set; } 052.    public DelegateCommand<object> ApptEditedCommand { get; set; } 053.    public DelegateCommand<object> ApptDeletedCommand { get; set; } 054.   055.    public SchedulerViewModel(IEventAggregator eventAgg, IRegionManager regionmanager) 056.    { 057.        // set Unity items 058.        this.eventAggregator = eventAgg; 059.        this.regionManager = regionmanager; 060.   061.        // load our context 062.        context = new RecruitingContext(); 063.        LoadOperation<Interview> loadOp = context.Load(context.GetInterviewsQuery()); 064.        loadOp.Completed += new EventHandler(loadOp_Completed); 065.   066.        this._jobsList = new QueryableCollectionView(context.JobPostings); 067.        context.Load(context.GetJobPostingsQuery()); 068.   069.        this._applicantList = new QueryableCollectionView(context.Applicants); 070.        context.Load(context.GetApplicantsQuery()); 071.   072.        AddAppointmentCommand = new DelegateCommand<object>(this.AddAppt); 073.        ApptCreatingCommand = new DelegateCommand<object>(this.ApptCreating); 074.        ApptEditedCommand = new DelegateCommand<object>(this.ApptEdited); 075.        ApptDeletedCommand = new DelegateCommand<object>(this.ApptDeleted); 076.   077.    } 078.   079.    void loadOp_Completed(object sender, EventArgs e) 080.    { 081.        LoadOperation loadop = sender as LoadOperation; 082.   083.        foreach (var ent in loadop.Entities) 084.        { 085.            _interviews.Add(EntityToAppointment(ent as Interview)); 086.        } 087.    } 088.   089.    #region Appointment Adding 090.   091.    public void AddAppt(object obj) 092.    { 093.        // now we have a new InterviewAppointment to add to our QCV :) 094.        InterviewAppointment newInterview = obj as InterviewAppointment; 095.   096.        this.context.Interviews.Add(AppointmentToEntity(newInterview)); 097.        this.context.SubmitChanges((s) => 098.        { 099.            ActionHistory myAction = new ActionHistory(); 100.            myAction.InterviewID = newInterview.InterviewID; 101.            myAction.PostingID = newInterview.PostingID; 102.            myAction.ApplicantID = newInterview.ApplicantID; 103.            myAction.Description = String.Format("Interview with {0} has been created by {1}", newInterview.ApplicantID.ToString(), "default user"); 104.            myAction.TimeStamp = DateTime.Now; 105.            eventAggregator.GetEvent<AddActionEvent>().Publish(myAction); 106.        } 107.            , null); 108.    } 109.   110.    public void ApptCreating(object obj) 111.    { 112.        // handled in the behavior, just a placeholder to ensure it runs :) 113.    } 114.   115.    #endregion 116.   117.    #region Appointment Editing 118.   119.    public void ApptEdited(object obj) 120.    { 121.        Interview editedInterview = (from x in context.Interviews 122.                            where x.InterviewID == (obj as InterviewAppointment).InterviewID 123.                            select x).SingleOrDefault(); 124.   125.        CopyAppointmentEdit(editedInterview, obj as InterviewAppointment); 126.   127.        context.SubmitChanges((s) => { 128.            ActionHistory myAction = new ActionHistory(); 129.            myAction.InterviewID = editedInterview.InterviewID; 130.            myAction.PostingID = editedInterview.PostingID; 131.            myAction.ApplicantID = editedInterview.ApplicantID; 132.            myAction.Description = String.Format("Interview with {0} has been modified by {1}", editedInterview.ApplicantID.ToString(), "default user"); 133.            myAction.TimeStamp = DateTime.Now; 134.            eventAggregator.GetEvent<AddActionEvent>().Publish(myAction); } 135.            , null); 136.    } 137.   138.    #endregion 139.   140.    #region Appointment Deleting 141.   142.    public void ApptDeleted(object obj) 143.    { 144.        Interview deletedInterview = (from x in context.Interviews 145.                                      where x.InterviewID == (obj as InterviewAppointment).InterviewID 146.                                      select x).SingleOrDefault(); 147.   148.        context.Interviews.Remove(deletedInterview); 149.        context.SubmitChanges((s) => 150.        { 151.            ActionHistory myAction = new ActionHistory(); 152.            myAction.InterviewID = deletedInterview.InterviewID; 153.            myAction.PostingID = deletedInterview.PostingID; 154.            myAction.ApplicantID = deletedInterview.ApplicantID; 155.            myAction.Description = String.Format("Interview with {0} has been deleted by {1}", deletedInterview.ApplicantID.ToString(), "default user"); 156.            myAction.TimeStamp = DateTime.Now; 157.            eventAggregator.GetEvent<AddActionEvent>().Publish(myAction); 158.        } 159.            , null); 160.    } 161.   162.    #endregion 163.   164.    #region Appointment Helpers :) 165.   166.    public Interview AppointmentToEntity(InterviewAppointment ia) 167.    { 168.        Interview newInterview = new Interview(); 169.        newInterview.Subject = ia.Subject; 170.        newInterview.Body = ia.Body; 171.        newInterview.Start = ia.Start; 172.        newInterview.End = ia.End; 173.        newInterview.ApplicantID = ia.ApplicantID; 174.        newInterview.PostingID = ia.PostingID; 175.        newInterview.InterviewID = ia.InterviewID; 176.   177.        return newInterview; 178.    } 179.   180.    public InterviewAppointment EntityToAppointment(Interview ia) 181.    { 182.        InterviewAppointment newInterview = new InterviewAppointment(); 183.        newInterview.Subject = ia.Subject; 184.        newInterview.Body = ia.Body; 185.        newInterview.Start = ia.Start; 186.        newInterview.End = ia.End; 187.        newInterview.ApplicantID = ia.ApplicantID; 188.        newInterview.PostingID = ia.PostingID; 189.        newInterview.InterviewID = ia.InterviewID; 190.   191.        return newInterview; 192.    } 193.   194.    public void CopyAppointmentEdit(Interview entityInterview, InterviewAppointment appointmentInterview) 195.    { 196.        entityInterview.Subject = appointmentInterview.Subject; 197.        entityInterview.Body = appointmentInterview.Body; 198.        entityInterview.Start = appointmentInterview.Start; 199.        entityInterview.End = appointmentInterview.End; 200.        entityInterview.ApplicantID = appointmentInterview.ApplicantID; 201.        entityInterview.PostingID = appointmentInterview.PostingID; 202.    } 203.   204.    #endregion 205.} One thing we're doing here which you won't see in any of the other ViewModels is creating a duplicate collection.  I know this is something which will be fixed down the line for using RadScheduler, simplifying this process, but with WCF RIA changing as it does I wanted to ensure functionality would remain consistent as I continued development on this application.  So, I do a little bit of duplication, but for the greater good.  This all takes place starting on line 79, so for every entity that comes back we add it to the collection that is bound to RadScheduler.  Otherwise, the DelegateCommands that you see correspond directly to the events they are named after.  In each case, rather than sending over the full event arguments, I just send in the appointment in question (coming through as the object obj in all cases) so I can add (line 91), edit (line 119), and delete appointments (line 142) like normal.  This just ensures they get updated back to my database.  Also, the one bit of code you won't see is for the Appointment Creating (line 110) event- that is because in the command I've created I simply make the replacement I need to: 1.void element_AppointmentCreating(object sender, AppointmentCreatingEventArgs e) 2.{ 3.    e.NewAppointment = new InterviewAppointment(); 4.    base.ExecuteCommand(); 5.} And the ViewModel is none the wiser, the appointments just work as far as it is concerned since as they are created they become InterviewAppointments.  End result?  I've customized my EditAppointmentDialog as follows: And adding, editing, and deleting appointments works like a charm.  I can even 'edit' by moving appointments around RadScheduler, so as they are dropped into a timeslot they perform their full edit routine and things get updated. And then, the Code-Behind Version Perhaps the thing I like the most about doing one then the other is I get to steal 90% or more of the code from the MVVM version.  For example, the only real changes to the Code-Behind Xaml file exist in the control declaration, in which I use events instead of attached-behavior-event-commands: 01.<telerikScheduler:RadScheduler x:Name="xJobsScheduler" 02.                  Grid.Row="1" 03.                  Grid.Column="1" 04.                  Width="800" 05.                  MinWidth="600" 06.                  Height="500" 07.                  MinHeight="300" 08.                  EditAppointmentStyle="{StaticResource EditAppointmentStyle}" 09.                  AppointmentAdded="xJobsScheduler_AppointmentAdded" 10.                  AppointmentCreating="xJobsScheduler_AppointmentCreating" 11.                  AppointmentEdited="xJobsScheduler_AppointmentEdited" 12.                  AppointmentDeleted="xJobsScheduler_AppointmentDeleted"> 13.</telerikScheduler:RadScheduler> Easy, right?  Otherwise, all the same styling in UserControl.Resources was re-used, right down to the DataContextProxy that lets us bind to a collection from our viewmodel (in this case, our code-behind) to use within the DataTemplate.  The code conversion gets even easier, as I could literally copy and paste almost everything from the ViewModel to my Code-Behind, just a matter of pasting the right section into the right event.  Here's the code-behind as proof: 001.public partial class SchedulingView : UserControl, INotifyPropertyChanged 002.{ 003.    public RecruitingContext context; 004.   005.    private QueryableCollectionView _jobsList; 006.    public QueryableCollectionView JobsList 007.    { 008.        get { return this._jobsList; } 009.        set 010.        { 011.            if (this._jobsList != value) 012.            { 013.                this._jobsList = value; 014.                this.NotifyChanged("JobsList"); 015.            } 016.        } 017.    } 018.   019.    private QueryableCollectionView _applicantList; 020.    public QueryableCollectionView ApplicantList 021.    { 022.        get { return _applicantList; } 023.        set 024.        { 025.            if (_applicantList != value) 026.            { 027.                _applicantList = value; 028.                NotifyChanged("ApplicantList"); 029.            } 030.        } 031.    } 032.   033.    private ObservableItemCollection<InterviewAppointment> _interviews = new ObservableItemCollection<InterviewAppointment>(); 034.    public ObservableItemCollection<InterviewAppointment> Interviews 035.    { 036.        get { return _interviews; } 037.        set 038.        { 039.            if (_interviews != value) 040.            { 041.                _interviews = value; 042.                NotifyChanged("Interviews"); 043.            } 044.        } 045.    } 046.   047.    public SchedulingView() 048.    { 049.        InitializeComponent(); 050.   051.        this.DataContext = this; 052.   053.        this.Loaded += new RoutedEventHandler(SchedulingView_Loaded); 054.    } 055.   056.    void SchedulingView_Loaded(object sender, RoutedEventArgs e) 057.    { 058.        this.xJobsScheduler.AppointmentsSource = Interviews; 059.   060.        context = new RecruitingContext(); 061.           062.        LoadOperation loadop = context.Load(context.GetInterviewsQuery()); 063.        loadop.Completed += new EventHandler(loadop_Completed); 064.   065.        this._applicantList = new QueryableCollectionView(context.Applicants); 066.        context.Load(context.GetApplicantsQuery()); 067.   068.        this._jobsList = new QueryableCollectionView(context.JobPostings); 069.        context.Load(context.GetJobPostingsQuery()); 070.    } 071.   072.    void loadop_Completed(object sender, EventArgs e) 073.    { 074.        LoadOperation loadop = sender as LoadOperation; 075.   076.        _interviews.Clear(); 077.   078.        foreach (var ent in loadop.Entities) 079.        { 080.            _interviews.Add(EntityToAppointment(ent as Interview)); 081.        } 082.    } 083.   084.    private void xJobsScheduler_AppointmentAdded(object sender, Telerik.Windows.Controls.AppointmentAddedEventArgs e) 085.    { 086.        // now we have a new InterviewAppointment to add to our QCV :) 087.        InterviewAppointment newInterview = e.Appointment as InterviewAppointment; 088.   089.        this.context.Interviews.Add(AppointmentToEntity(newInterview)); 090.        this.context.SubmitChanges((s) => 091.        { 092.            ActionHistory myAction = new ActionHistory(); 093.            myAction.InterviewID = newInterview.InterviewID; 094.            myAction.PostingID = newInterview.PostingID; 095.            myAction.ApplicantID = newInterview.ApplicantID; 096.            myAction.Description = String.Format("Interview with {0} has been created by {1}", newInterview.ApplicantID.ToString(), "default user"); 097.            myAction.TimeStamp = DateTime.Now; 098.            context.ActionHistories.Add(myAction); 099.            context.SubmitChanges(); 100.        } 101.            , null); 102.    } 103.   104.    private void xJobsScheduler_AppointmentCreating(object sender, Telerik.Windows.Controls.AppointmentCreatingEventArgs e) 105.    { 106.        e.NewAppointment = new InterviewAppointment(); 107.    } 108.   109.    private void xJobsScheduler_AppointmentEdited(object sender, Telerik.Windows.Controls.AppointmentEditedEventArgs e) 110.    { 111.        Interview editedInterview = (from x in context.Interviews 112.                                     where x.InterviewID == (e.Appointment as InterviewAppointment).InterviewID 113.                                     select x).SingleOrDefault(); 114.   115.        CopyAppointmentEdit(editedInterview, e.Appointment as InterviewAppointment); 116.   117.        context.SubmitChanges((s) => 118.        { 119.            ActionHistory myAction = new ActionHistory(); 120.            myAction.InterviewID = editedInterview.InterviewID; 121.            myAction.PostingID = editedInterview.PostingID; 122.            myAction.ApplicantID = editedInterview.ApplicantID; 123.            myAction.Description = String.Format("Interview with {0} has been modified by {1}", editedInterview.ApplicantID.ToString(), "default user"); 124.            myAction.TimeStamp = DateTime.Now; 125.            context.ActionHistories.Add(myAction); 126.            context.SubmitChanges(); 127.        } 128.            , null); 129.    } 130.   131.    private void xJobsScheduler_AppointmentDeleted(object sender, Telerik.Windows.Controls.AppointmentDeletedEventArgs e) 132.    { 133.        Interview deletedInterview = (from x in context.Interviews 134.                                      where x.InterviewID == (e.Appointment as InterviewAppointment).InterviewID 135.                                      select x).SingleOrDefault(); 136.   137.        context.Interviews.Remove(deletedInterview); 138.        context.SubmitChanges((s) => 139.        { 140.            ActionHistory myAction = new ActionHistory(); 141.            myAction.InterviewID = deletedInterview.InterviewID; 142.            myAction.PostingID = deletedInterview.PostingID; 143.            myAction.ApplicantID = deletedInterview.ApplicantID; 144.            myAction.Description = String.Format("Interview with {0} has been deleted by {1}", deletedInterview.ApplicantID.ToString(), "default user"); 145.            myAction.TimeStamp = DateTime.Now; 146.            context.ActionHistories.Add(myAction); 147.            context.SubmitChanges(); 148.        } 149.            , null); 150.    } 151.   152.    #region Appointment Helpers :) 153.   154.    public Interview AppointmentToEntity(InterviewAppointment ia) 155.    { 156.        Interview newInterview = new Interview(); 157.        newInterview.Subject = ia.Subject; 158.        newInterview.Body = ia.Body; 159.        newInterview.Start = ia.Start; 160.        newInterview.End = ia.End; 161.        newInterview.ApplicantID = ia.ApplicantID; 162.        newInterview.PostingID = ia.PostingID; 163.        newInterview.InterviewID = ia.InterviewID; 164.   165.        return newInterview; 166.    } 167.   168.    public InterviewAppointment EntityToAppointment(Interview ia) 169.    { 170.        InterviewAppointment newInterview = new InterviewAppointment(); 171.        newInterview.Subject = ia.Subject; 172.        newInterview.Body = ia.Body; 173.        newInterview.Start = ia.Start; 174.        newInterview.End = ia.End; 175.        newInterview.ApplicantID = ia.ApplicantID; 176.        newInterview.PostingID = ia.PostingID; 177.        newInterview.InterviewID = ia.InterviewID; 178.   179.        return newInterview; 180.    } 181.   182.    public void CopyAppointmentEdit(Interview entityInterview, InterviewAppointment appointmentInterview) 183.    { 184.        entityInterview.Subject = appointmentInterview.Subject; 185.        entityInterview.Body = appointmentInterview.Body; 186.        entityInterview.Start = appointmentInterview.Start; 187.        entityInterview.End = appointmentInterview.End; 188.        entityInterview.ApplicantID = appointmentInterview.ApplicantID; 189.        entityInterview.PostingID = appointmentInterview.PostingID; 190.    } 191.   192.    #endregion 193.   194.    #region INotifyPropertyChanged Members 195.   196.    public event PropertyChangedEventHandler PropertyChanged; 197.   198.    public void NotifyChanged(string propertyName) 199.    { 200.        if (string.IsNullOrEmpty(propertyName)) 201.            throw new ArgumentException("propertyName"); 202.   203.        PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 204.    } 205.   206.    #endregion 207.} Nice... right? :) One really important thing to note as well.  See on line 51 where I set the DataContext before the Loaded event?  This is super important, as if you don't have this set before the usercontrol is loaded, the DataContextProxy has no context to use and your EditAppointmentDialog Job/Applicant dropdowns will be blank and empty.  Trust me on this, took a little bit of debugging to figure out that by setting the DataContext post-loaded would only lead to disaster and frustration.  Otherwise, the only other real difference is that instead of sending an ActionHistory item through an event to get added to the database and saved, I do those right in the callback from submitting.  The Result Again, I only have to post one picture because these bad boys used nearly identical code for both the MVVM and the code-behind views, so our end result is... So what have we learned here today?  One, for the most part this MVVM thing is somewhat easy.  Yeah, you sometimes have to write a bunch of extra code, but with the help of a few useful snippits you can turn the process into a pretty streamlined little workflow.  Heck, this story gets even easier as you can see in this blog post by Michael Washington- specifically run a find on 'InvokeCommandAction' and you'll see the section regarding the command on TreeView in Blend 4.  Brilliant!  MVVM never looked so sweet! Otherwise, it is business as usual with RadScheduler for Silverlight whichever path you're choosing for your development.  Between now and the next post, I'll be cleaning up styles a bit (those RadComboBoxes are a little too close to my labels!) and adding some to the RowDetailsViews for Applicants and Jobs, so you can see all the info for an appointment in the dropdown tab view.  Otherwise, we're about ready to call a wrap on this oneDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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