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• What is difference between " * " and "Auto" in Silverlight Grid Layout Definitions

  - by user203687

  trying to understand the following: <Grid Name="Root"> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> </Grid> Can anyone help me in explaining the difference between * and Auto in the above snippet? thanks

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• ASP.NET MVC: What's the difference in concept between Service and Repository

  - by Richard77

  Hello, The question I'm asking is kind of subjective. I've seen twice, while exercising with real projects such as StoreFront, both Repository and Services. Sometimes they can just be folders or projects attached to the solution. But they contain classes and interfaces. So, I'd like to know what goes to the repository and what goes to the services. So far, I was familiar with repositories (we put methods and properties in the repository to reduce the complexity in the controller). How about the services? So, ASP.NET MVC: What's the difference in concept between Service and Repository? (Maybe none) My question is Kind of subjective, but I'd like to make sure that I'm not missing anything. Thanks for helping

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• Difference between C++ Keyboard keycode and JAVA KeyEvent keycode

  - by Auxiliary

  I noticed a difference between the keycodes that vkCode in C++ gives and the ones that Java's KeyEvent gives us. (Ofcourse the normal characters have the same code (0 = 48 just like the ASCII) but they differ in the other keys). Is there a way to 'translate' them from one to the other (What's the logic behind each one?) or am I supposed to use loads of switches and IFs for that. If it helps, my app is half in C++ and half in JAVA because of the Native Hooks that c++ gives us and it gets the keycodes of the keys that the user presses and then the java is going to use them. Thanks in advance.

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• time difference on heroku server

  - by railsnew

  There seems to be a time difference on heroku server. >> Customer.last.id => 584 >> Customer.last.created_at => Thu, 06 May 2010 01:43:20 UTC +00:00 >> Time.zone => #<ActiveSupport::TimeZone:0x2b1dec47e5c0 @utc_offset=0, @tzinfo=#<TZInfo::DataTimezone: Etc/UTC>, @name="UTC"> >> Time.now => Wed May 05 19:05:15 -0700 2010 >> Time.now.zone => "PDT" Notice that current time is May 05 19...however, created_at date for last record is May 06 01:43. This does not make any sense. What can be causing this and how would I go about fixing this?

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• difference between AJAX POST and GET

  - by Mohit Kumar

  $.ajax({ type: 'POST', url: path, data: '{AreaID: ' + parentDropdownList.val() + '}', contentType: 'application/json; charset=utf-8', dataType: 'json', success: function(response) { } }); In above code I am using type: 'POST'. My senior told me that I also can use 'GET' in type. But dint find the difference between 'POST' and 'GET' and I also want to know what is the use of type, contentType, and dataType. Could anyone one explain me why we use these type, contentType and dataType. Thanks in advance.

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• What is the difference between Window.load and document.readyState

  - by prakash

  Hi All, I have one question , In my ASP.NET MVC web application i have to do certain validation once page and all controls got loaded. In javascript i was using belwow line of code for calling a method. window.load = JavascriptFunctionName ; Some one from my team asked me not used above line of code Instead use JQuery to do the same document.attachEvent("onreadystatechange", function() { if (document.readyState === "complete") { CheckThis(); } }); Please help me in understanding what is the difference between two. When i tested by keeping alert in both Jquery check is executing first and calling the CheckThis function where as window.load is taking some time and executing after it. Please suggest

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• System.Interactive: Difference between Memoize() and MemoizeAll()?

  - by Joel Mueller

  In System.Interactive.dll (v1.0.2521.0) from Reactive Extensions, EnumerableEx has both a Memoize method and a MemoizeAll method. The API documentation is identical for both of them: Creates an enumerable that enumerates the original enumerable only once and caches its results. However, these methods are clearly not identical. If I use Memoize, my enumerable has values the first time I enumerate it, and seems to be empty the second time. If I use MemoizeAll then I get the behavior I would expect from the description of either method - I can enumerate the result as many times as I want and get the same results each time, but the source is only enumerated once. Can anyone tell me what the intended difference between these methods is? What is the use-case for Memoize? It seems like a fairly useless method with really confusing documentation.

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• what is the exact difference between PHP static class and singleton class

  - by Saif Bechan

  I have always used a Singleton class for a registry object in PHP. As all Singleton classes I think the main method looks like this: class registry { public static function singleton() { if( !isset( self::$instance ) ) { self::$instance = new registry(); } return self::$instance; } public function doSomething() { echo 'something'; } } So whenever I need something of the registry class I use a function like this: registry::singleton()->doSomethine(); Now I do not understand what the difference is between creating just a normal static function. Will it create a new object if I just use a normal static class. class registry { public static function doSomething() { echo 'something'; } } Now I can just use: registry::doSomethine(); Can someone explain to me what the function is of the singleton class. I really do not understand this.

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• Difference between static const char* and const char*.

  - by Will MacDonagh

  Could someone please explain the difference in how the 2 snippets of code are handled below? They definitely compile to different assembly code, but I'm trying to understand how the code might act differently. I understand that string literals are thrown into read only memory and are effectively static, but how does that differ from the explicit static below? struct Obj1 { void Foo() { const char* str( "hello" ); } }; and struct Obj2 { void Bar() { static const char* str( "hello" ); } };

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• What is the difference between remote procedure call and web service

  - by xiao

  Is there any clear definition about RPC and Web Service? A quick wikipedia search shows: RPC: Remote procedure call (RPC) is an Inter-process communication technology that allows a computer program to cause a subroutine or procedure to execute in another address space (commonly on another computer on a shared network) without the programmer explicitly coding the details for this remote interaction. Web Service: Web services are typically application programming interfaces (API) or web APIs that are accessed via Hypertext Transfer Protocol and executed on a remote system hosting the requested services. Web services tend to fall into one of two camps: Big Web Services[1] and RESTful Web Services. I am not quite clear what the real difference between the two things. It seems that one thing could belongs to RPC and is kind of web service at the same time. Is Web Service a higher level representation of RPC?

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• Difference in techniques for setting a stubbed method's return value with Rhino Mocks

  - by CRice

  What is the main difference between these following two ways to give a method some fake implementation? I was using the second way fine in one test but in another test the behaviour can not be achieved unless I go with the first way. These are set up via: IMembershipService service = test.Stub<IMembershipService>(); so (the first), using (test.Record()) //test is MockRepository instance { service.GetUser("dummyName"); LastCall.Return(new LoginUser()); } vs (the second). service.Stub(r => r.GetUser("dummyName")).Return(new LoginUser()); Edit The problem is that the second technique returns null in the test, when I expect it to return a new LoginUser. The first technique behaves as expected by returning a new LoginUser. All other test code used in both cases is identical.

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• What is the difference between declaring data attributes inside or outside __init__

  - by user1898540

  I'm trying to get my head around OOP in Python and I'm a bit confused when it comes to declare variables within a class. Should I declare them inside of the __init__ procedure or outside it? What's the difference? The following code works just fine: # Declaring variables within __init__ class MyClass: def __init__(self): country = "" city = "" def information(self): print "Hi! I'm from %s, (%s)"%(self.city,self.country) me = MyClass() me.country = "Spain" me.city = "Barcelona" me.information() But declaring the variables outside of the __init procedure also works: # Declaring variables outside of __init__ class MyClass: country = "" city = "" def information(self): print "Hi! I'm from %s, (%s)"%(self.city,self.country) me = MyClass() me.country = "Spain" me.city = "Barcelona" me.information()

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• What is the difference between IEditableObject and IRevertibleChangeTracking?

  - by open-collar

  What is the difference between IEditableObject and IRevertibleChangeTracking (both from the System.ComponentModel namespace)? It looks as if the first supports explicit transaction whilst the second is more implicit - but the net result is the same. How should I go about implementing this in code? At the moment I do nothing in BeginEdit and call RejectChanges and AcceptChanges in EndEdit and CancelEdit respectively. My problem is that this will also accept the changes made prior to the BeginEdit. Is that really what MS wanted or am I trying to implement two mutually exclusive interfaces?

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• What's the difference between PATH_NOT_FOUND and NAME_NOT_FOUND

  - by Benjamin

  In Win32 layer, we often meet ERROR_PATH_NOT_FOUND, ERROR_NAME_NOT_FOUND. When does WinAPI(eg CreateFileW, RemoveDirectoryW) return these values? And What's the difference? If I write a file system driver, when do I set STATUS_OBJECT_PATH_NOT_FOUND or STATUS_OBJECT_NAME_NOT_FOUND? I'm so confused. Is there anyone who can explain clearly? Or are there any documents explain this? I couldn't find them. Thanks in advance.

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• What is the difference between if ($this-> _hasParam('name') and if($this->_getParam('name')), Ze

  - by Linto davis

  I want to check in zend, whether a posted form value 'name' contains a value.For this i have used the following code one method if ($this->_getPatram('name') != null ) { echo 'field name contains value'; } else { echo 'field name contains no value'; } second method if ($this->_hasParam('name')) { echo 'field name contains value'; } else { echo 'field name contains no value'; } output , when submitting the form with the 'name' field contains no value in first method field name contains no value (result is correct) in second method field name contains value (result is wrong) So what is the difference between these two ? _hasParam and _getParam

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• Difference between redirecting to a page and coming to the same page after pressing back button

  - by Mac

  Actually i have a page in which i am not using cache by using this code HttpContext.Current.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1)); HttpContext.Current.Response.Cache.SetValidUntilExpires(false); HttpContext.Current.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches); HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache); HttpContext.Current.Response.Cache.SetNoStore(); now i want to know is there any difference between coming to this page using a proper link or coming back using browser back button or is there any way to detect this.

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• How to difference sockaddr_in struct from same subnetwork and different IP/users

  - by user1428926

  I am developing a gaming server using the Winsock2 API from Windows, just for now until porting it to Linux. The main problem I have found is that I don't know how to differentiate gaming clients that come from the same router/network. Let´s imagine 2 gamers that are in the same network going to the Internet through the same router IP and port with, for example IP 220.100.100.100 and port 5000, how can my C/C++ server differentiate both TCP connections and know that they are two different gamers? Can I find any difference in the sockaddr_in struct that returns the socket when accept(...) returns ??

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• difference in using virtual and not using virtual

  - by numerical25

  In C++, whether you choose to use virtual or not, you can still override the base class function. The following compiles just fine... class Enemy { public: void SelectAnimation(); void RunAI(); void Interact() { cout<<"Hi I am a regular Enemy"; } private: int m_iHitPoints; }; class Boss : public Enemy { public: void Interact() { cout<<"Hi I am a evil Boss"; } }; So my question is what is the difference in using or not using the virtual function. And what is the disadvantage.

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• getting values by time difference in SQL

  - by Maestro1024

  I want to get the difference of two values within a time frame. so I have a table like this Data Table TimeStamp DataValue 2010-06-01 21 2010-06-03 33 2010-06-05 44 So I want to first get all data over the last month which I can do with something like. ([TimeStamp] < GETDATE()-0 and ([TimeStamp] > GETDATE()-31) But I want to see how much value added on over the course of the month. So it started at 21 and went to 44. So I would expect this example to to return 23 (as in 44-21). How would I build a query like this?

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• C++ difference of keywords 'typename' and 'class' in templates

  - by Mat

  For templates I have seen both declarations: template < typename T > And: template < class T > What's the difference? And what exactly do those keywords mean in the following example (taken from the German Wikipedia article about templates)? template < template < typename, typename > class Container, typename Type > class Example { Container< Type, std::allocator < Type > > baz; };

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• What are the difference between Cygwin on windows and real UNIX environment

  - by Tarun

  Hi, I am a C/C++ developer. I have never done C++ programming on UNIX, I have done only on windows. I want to practice C++ on Unix. (Because all big companies ask C++ with Unix). I have a laptop on which i do not want to install any other OS (because i have installed very important software on it and i don't have setups) So, I searched and found CygWin which is Unix emulator for Windows. I am thinking to practice C++ on this. Please help me, how can I practice/learn in more close to the environment(Unix Environment) that is used in Big companies like IBM. What will be the difference between Unix and Cygwin?

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• In Blackberry's Application class what is the difference between hasEventThread() and isHandlingEven

  - by Eric Sniff

  In Blackberry's Application class what is the difference between hasEventThread() and isHandlingEvents(). I'm just curious, because I have only found hasEventThread useful. From BB's docs for Applicaiton: public boolean hasEventThread() Determines if this application has entered the event dispatcher. Returns: True if this application has entered the event dispatcher (i.e. has invoked Application.enterEventDispatcher()); otherwise, false. isHandlingEvents public final boolean isHandlingEvents() Determines if this application has entered the event dispatch loop. Returns: True if the application has entered the event dispatch loop; otherwise, false. My only guess is that isHandlingEvents most happen sometime after hasEventThread. But is that really that useful?

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• Difference between jQuery click, bind, live, delegate & trigger functions( with example)

  - by I Like PHP

  Hello All, I know there are a lot of questions similar to this, but I want to know clear difference between all of these jQuery functions together on this page with an example, so that it will be very helpful for me to understand the mechanism of all of these functions. I have also read the reference on jQuery main site, but there is no comparison between these: $().click(fn) $().bind('click',fn) $().live('click',fn) $().delegate('td','click',fn) $().trigger('click') // UPDATED Please do not refer any link if there is a part of question belong to that. Please describe how all four function exactly works in different manner, and which should be preferred in which situation. Note: If there are any other function with same functionality/mechanism , then please share. Thanks a lot. Update i have also seen $(trigger) function? is this works similar to above four function ?

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• The difference between delete and delete [] in C++

  - by Ilya Melamed

  I've written a class that contains two pointers, one is char* color_ and one in vertexesset* vertex_ where vertexesset is a class I created. In the destractor I've written at start delete [] color_; delete [] vertex_; When It came to the destructor it gave me a segmentation fault. Then I changed the destructor to: delete [] color_; delete vertex_; And now it works fine. What is the difference between the two?

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• What is the difference between release and nil

  - by HML

  I am new to iPhone SDK. I want to know that what is difference between release and nil. Yes, basic, I know. But my application crashing every time when I use release. If I use nil then its working fine. Here is code : cellName=[cellArray objectAtIndex:5]; UITextField *txtFieldTown = (UITextField *)[cellName.contentView viewWithTag:2]; StrTown=txtFieldTown.text; [txtFieldTown release]; txtFieldTown = nil; Here, if release line is removed, then its working fine. I know that I am not allocating txtFieldTown,so I should not worry but its retain count is 4. So I am trying to decrease that. Please help me.Thanking you...

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