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Why C# does not support multiple inheritance?

- by Jalpesh P. Vadgama

Yesterday, One of my friend Dharmendra ask me that why C# does not support multiple inheritance. This is question most of the people ask every time. So I thought it will be good to write a blog post about it. So why it does not support multiple inheritance? I tried to dig into the problem and I have found the some of good links from C# team from Microsoft for why it’s not supported in it. Following is a link for it. http://blogs.msdn.com/b/csharpfaq/archive/2004/03/07/85562.aspx Also, I was giving some of the example to my friend Dharmendra where multiple inheritance can be a problem.The problem is called the diamond problem. Let me explain a bit. If you have class that is inherited from the more then one classes and If two classes have same signature function then for child class object, It is impossible to call specific parent class method. Here is the link that explains more about diamond problem. http://en.wikipedia.org/wiki/Diamond_problem Now of some of people could ask me then why its supporting same implementation with the interfaces. But for interface you can call that method explicitly that this is the method for the first interface and this the method for second interface. This is not possible with multiple inheritance. Following is a example how we can implement the multiple interface to a class and call the explicit method for particular interface. Multiple Inheritance in C# That’s it. Hope you like it. Stay tuned for more update..Till then happy programming.

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Fixing SharePoint 2010 Permission Problems on Windows 7

- by Ricardo Peres

I had a tough time trying to have SharePoint working perfectly on a Windows 7 development machine that was occasionally disconnected from the Active Directory (when I am home I must connect through a VPN). I mostly had problems with service applications such as User Profile, Managed Metadata, Business Connectivity Services and the like, and all I knew were cryptical messages such as “access denied” or “the service or application pool is not started”. I was sure that both the services and application pools were running under a domain account that had proper permissions on the SQL Server instance, and basically it was a fresh installation. Lots of people are having the same problem, apparently. After banging my head against the wall for several days, I remembered about farm (what I had) versus stand-alone (which I had never tried) installations. Bingo! Here’s what I did: I dropped all SharePoint databases and logins and reinstalled SP from scratch, only this time not in farm mode, but as stand-alone. After the SharePoint Configuration Wizard started, I cancelled it and started the Management Shell. I created the configuration database manually by using the New-SPConfigurationDatabase cmdlet where I specified a local account – something that the Configuration Wizard wouldn’t allow me to do. Then I restarted the Configuration Wizard and everything began working perfectly! Yes, I got some pre-configured service applications and also some content which I didn’t need, but I realized it was possible to drop and recreate everything the way I wanted to. All services and application pools are now running under local accounts, which is fine for my development needs. Really, Microsoft… I hope this will bring light to someone facing the same problems!

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CQRS at Jax Code Camp 2012

- by brian_ritchie

Continuing my CQRS world tour...I gave my CQRS presentation at the Jax Code Camp 2012 this past Saturday. It was a great crowd with lots of representation from the wicked smart engineers at Feature[23] and others from the Jacksonville developer community. If you'd like to take a look at my slide deck, they are out on SlideShare. The code I demoed is from Ashic Mahtab and is posted on github. If you can't get enough of CQRS, Microsoft has joined the CQRS party with their CQRS Journey which includes a free e-book called Exploring CQRS and Event Sourcing.

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Speaking on MonoDroid - Android Developer Conference (AnDevCon) - March, 2011 in San Francisco

- by Wallym

I'm honored to announce that I'll be speaking at AnDevCon in March, 2011 in San Francisco. I've been spending a significant amount of time on iPhone and Android. I'm trying to get a startup off the ground. Mobile devices will be an integral part of this startup. As such, iPhone and Android will be our target devices at this point in time. I'll be doing an all day pre-class as well as parts of the pre-class as sessions through out the conference. I'm looking forward to this. If you are interested in Android Development, please come to this conference. If you are coming to this conference, please look me up while there.

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32 bit ODBC drivers on 64 bit Windows

- by guybarrette

It’s been a while since I had to use an ODBC driver. Today I learned… That when you install a 32 bit ODBC driver on a 64 bit Windows but it doesn’t show up in the Data Sources admin tool because this tool displays only 64 bit drivers. That you can manage a 32 bit ODBC driver on a 64 bit Windows using the 32 bit Data Sources admin tool located here: C:\Windows\SysWOW64\odbcad32.exe That 64 bit software can’t use 32 bit ODBC drivers. That 32 bit software installed on a 64 bit Windows can use 32 bit ODBC drivers. var addthis_pub="guybarrette";

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Rendering Text with the HTML5 Canvas

- by dwahlin

In a previous post I walked through the fundamentals of rendering shapes such as squares and circles using the HTML5 Canvas API. In this post I’ll provide a simple example of rendering and rotating text. To render text you can use the fillText() or strokeText() functions which take the text to render as well as the x and y coordinates of where to render it. To rotate text you can use the transform functions available with the HTML5 Canvas such as save(), rotate(), and restore(). To run the live demos that follow click the Result tab in the blue bar of each demo. Rendering Text This example provides a simple look at how text can be rendered using the HTML5 Canvas. It iterates through a loop, updates the text and font size dynamically, measures the width of the text using the measureText() function, and then calls fillText() to render the text with the desired font size to the screen. Here’s what the code above renders: Rotating Text This example shows how text can be rendered and even rotated by using transform functions built into the HTML5 Canvas. The code starts by rendering text the standard way using fillText(). It then saves the state of the canvas performs an x,y coordinate transform (moves to 100, 300 respectively) and then rotates the canvas –90 degrees using the rotate() function. After the text is rendered, the canvas is reverted back to it’s existing state (saved by calling the save() function) by calling the restore() function. An additional line of text is then rendered. Here’s what the code above renders: If you’re interested in learning more about the HTML5 Canvas and how it can be used in your Web or Windows 8 applications, check out my HTML5 Canvas Fundamentals course from Pluralsight.

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How to exclude copy local referenced assemblies from a VSIX

- by Daniel Cazzulino

When you add library references to project that are not reference assemblies or installed in the GAC, Visual Studio defaults to setting Copy Local to True: If, however, those dependencies are distributed by some other means (i.e. another extension, or are part of VS private assemblies, or whatever) and you want to avoid including them in your VSIX, you can add the following property to the project file: <PropertyGroup> ... <IncludeCopyLocalReferencesInVSIXContainer>false</IncludeCopyLocalReferencesInVSIXContainer>Read full article

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The Make Web Not War Train

- by guybarrette

If you’re from the Toronto area and want to attend the Make Web Not War conference in Montreal and on a tight budget, you may want to ride the DEVTrain from Toronto to Montreal for a mere $50 (roundtrip). All the info here var addthis_pub="guybarrette";

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Lesser Known NHibernate Session Methods

- by Ricardo Peres

The NHibernate ISession, the core of NHibernate usage, has some methods which are quite misunderstood and underused, to name a few, Merge, Persist, Replicate and SaveOrUpdateCopy. Their purpose is: Merge: copies properties from a transient entity to an eventually loaded entity with the same id in the first level cache; if there is no loaded entity with the same id, one will be loaded and placed in the first level cache first; if using version, the transient entity must have the same version as in the database; Persist: similar to Save or SaveOrUpdate, attaches a maybe new entity to the session, but does not generate an INSERT or UPDATE immediately and thus the entity does not get a database-generated id, it will only get it at flush time; Replicate: copies an instance from one session to another session, perhaps from a different session factory; SaveOrUpdateCopy: attaches a transient entity to the session and tries to save it. Here are some samples of its use. ISession session = ...; AuthorDetails existingDetails = session.Get<AuthorDetails>(1); //loads an entity and places it in the first level cache AuthorDetails detachedDetails = new AuthorDetails { ID = existingDetails.ID, Name = "Changed Name" }; //a detached entity with the same ID as the existing one Object mergedDetails = session.Merge(detachedDetails); //merges the Name property from the detached entity into the existing one; the detached entity does not get attached session.Flush(); //saves the existingDetails entity, since it is now dirty, due to the change in the Name property AuthorDetails details = ...; ISession session = ...; session.Persist(details); //details.ID is still 0 session.Flush(); //saves the details entity now and fetches its id ISessionFactory factory1 = ...; ISessionFactory factory2 = ...; ISession session1 = factory1.OpenSession(); ISession session2 = factory2.OpenSession(); AuthorDetails existingDetails = session1.Get<AuthorDetails>(1); //loads an entity session2.Replicate(existingDetails, ReplicationMode.Overwrite); //saves it into another session, overwriting any possibly existing one with the same id; other options are Ignore, where any existing record with the same id is left untouched, Exception, where an exception is thrown if there is a record with the same id and LatestVersion, where the latest version wins SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/2.0.320/scripts/clipboard.swf'; SyntaxHighlighter.brushes.CSharp.aliases = ['c#', 'c-sharp', 'csharp']; SyntaxHighlighter.all();

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Building Custom HTTP Help Pages with WCF

- by Jesse Ezell

Been asked this a few times and needed to figure it out myself, so I put together a post on how to host custom HTTP help pages for your WCF services: http://blog.iserviceoriented.com/index.php/2010/05/04/building-custom-http-help-pages-with-wcf/ A little help from the WCF team to open up some of the internal classes would make it more straightforward... until them, it takes a bit of hacking and black magic.

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Debugging Node.js applications for Windows Azure

- by cibrax

In case you are developing a new web application with Node.js for Windows Azure, you might notice there is no easy way to debug the application unless you are developing in an integrated IDE like Cloud9. For those that develop applications locally using a text editor (or WebMatrix) and Windows Azure Powershell for Node.js, it requires some steps not documented anywhere for the moment. I spent a few hours on this the other day I practically got nowhere until I received some help from Tomek and the rest of them. The IISNode version that currently ships with the Windows Azure for Node.js SDK does not support debugging by default, so you need to install the IISNode full version available in the github repository. Once you have installed the full version, you need to enable debugging for the web application by modifying the web.config file <iisnode debuggingEnabled="true" loggingEnabled="true" devErrorsEnabled="true" /> The xml above needs to be inserted within the existing “<system.webServer/>” section. The last step is to open a WebKit browser (e.g. Chrome) and navigate to the URL where your application is hosted but adding the segment “/debug” to the end. The full URL to the node.js application must be used, for example, http://localhost:81/myserver.js/debug That should open a new instance of Node inspector on the browser, so you can debug the application from there. Enjoy!!

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How should I update Ajax Control Toolkit in VS 2010?

- by Soham

Suppose if there is a new version available of Ajax Control Toolkit then how should I install/update it in my visual studio 2010 which has already install older version of same toolkit? I would like to install new one while older toolkit would totally uninstalled, because mostly new toolkit always has all controls that were in the old toolkit & also some new controls. Then 1) Should I've to remove .dll file in my toolkit installation folder and place new .dll file there? If I do so then will VS 2010 automatically delete older entries of toolkit controls in .NET Components list and place new control there? Or 2) Should I've to uninstall old toolkit manually i.e delete .dll file and uncheck all entries in .NET Components list & after that install new one from scratch?

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MEF, IServiceProvider and Testing Visual Studio Extensions

- by Daniel Cazzulino

In the latest and greatest version of Visual Studio, MEF plays a critical role, one that makes extending VS much more fun than it ever was. So typically, you just [Export] something, and then someone [Import]s it and that's it. MEF in all its glory kicks in and gets all your dependencies satisfied. Cool, you say, so let's now import ITextTemplating and have some T4-based codegen going! Ah, if only it was that easy. Turns out by default, none of the VS built-in services are exposed to MEF, apparently because there wasn't enough time to analyze the lifetime, initialization, dependencies, etc. for each one before launch, which makes perfect sense. You don't want to blindly export everything now just in case. There's also the whole VS package initialization thing which in this version of VS is not so transparently integrated with the MEF publishing side (i.e. a MEF export from a package can get instantiated before its owning package, and in fact, the package can remain unloaded forever and the export will continue to be visible to anyone)....Read full article

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Single Key Multiple Values Data Structure for one to many mapping

- by nijhawan.saurabh

Dictionaries are good, they are great to store Key / Value pairs but what if you want to store multiple values for a single key? Dictionaries would not allow duplicate keys. I came across a nice way to represent such a Data Structure using one of the Extension Method (ToLookup) present in System.Linq Namespace which converts an IEnumerable<T> to an ILookup<TKey, TElement>. Now, there are two parameters this method expects (The other overload expects 3 parameters): IEnumerable<TSource> - This list would contain the actual data. Func<TSource, TKey> keySelector - The Delegate which which computes the keys The method returns the following: ILookup<TKey, TElement> This DS would store Keys and multiple values along those keys. Let's see a small example: 12 using System; 13 using System.Collections.Generic; 14 using System.Linq; 15 16 /// <summary> 17 /// </summary> 18 internal class Program 19 { 20 #region Methods 21 22 /// <summary> 23 /// </summary> 24 /// <param name="args"> 25 /// The args. 26 /// </param> 27 private static void Main(string[] args) 28 { 29 // Create an array of strings. 30 var list = new List<string> { "IceCream1", "Chocolate Moose", "IceCream2" }; 31 32 // Generate a lookup Data Structure 33 ILookup<int, string> lookupDs = list.ToLookup(item => item.Length); 34 35 // Enumerate groupings. 36 foreach (var group in lookupDs) 37 { 38 foreach (string element in group) 39 { 40 Console.WriteLine(element); 41 } 42 } 43 } Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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Tales of a corrupt SQL log

- by guybarrette

Warning: I’m a simple dev, not an all powerful DBA with godly powers. This morning, one of my sites was down and DNN reported a problem with the database. A quick series of tests revealed that the culprit was a corrupted log file. Easy fix I said, I have daily backups so it’s just a mater of restoring a good copy of the database and log files. Well, I found out that’s not exactly true. You see, for this database, I have daily file backups and these are not database backups created by SQL Server. So I restored a set of files from a couple of days ago, stopped the SQL service, copied the files over the bad ones, restarted the service only to find out that SQL doesn’t like when you do that. It suspects something fishy and marks the database as suspect. A database marked as suspect can’t be accessed at all. So now what? I searched throughout the tubes of the InterWeb and found that you can restore from a corrupted log file by creating a new database with the same name as the defective one, then copy the restored database file (the one with data) over the newly created one. Sweet! But you still end up with SQL marking the database as suspect but at least, the newly created log is OK. Well not true, it’s not corrupted but the lack of data makes it not OK for SQL so you need to rebuild the log. How can you do that when SQL blocks any action the database? First, you need to change the database status from suspect to emergency. Then you need to set the database for single access only. After that, you need to repair the log with DBCC and do the DBA dance. If you dance long enough, SQL should repair the log file. Now you need to set the access back to multi user. Here’s the T-SQL script: use master GO EXEC sp_resetstatus 'MyDatabase' ALTER DATABASE MyDatabase SET EMERGENCY Alter database MyDatabase set Single_User DBCC checkdb('MyDatabase') ALTER DATABASE MyDatabase SET SINGLE_USER WITH ROLLBACK IMMEDIATE DBCC CheckDB ('MyDatabase', REPAIR_ALLOW_DATA_LOSS) ALTER DATABASE MyDatabase SET MULTI_USER So I guess that I would have been a lot easier to restore a SQL backup. I can’t really say but the InterWeb seems to say so. Anyway, lessons learned: Vive la différence: File backups are different then SQL backups. Don’t touch me: SQL doesn’t like when you restore a file over a corrupted one. The more the merrier: You should do both SQL and file backups. WTF?: The InterWeb provides you with dozens of way to deal with the problem but many are SQL 2000 or SQL 2005 only, many are confusing and many are written in strange dialects only DBAs understand. var addthis_pub="guybarrette";

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Interesting links week #1

- by erwin21

Below a list of interesting links that I found this week: Frontend: 10 Tips for Optimizing Web Form Submission Usability 10 Valuable Tips and Tricks for Designing HTML Emails 8 useful sites for web developers Development: Mono for Android Other: 7 Exciting Web Development Trends for 2011 Interested in more interesting links follow me at twitter http://twitter.com/erwingriekspoor

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Creating a XAML Tile Control

- by psheriff

One of the navigation mechanisms used in Windows 8 and Windows Phone is a Tile. A tile is a large rectangle that can have words and pictures that a user can click on. You can build your own version of a Tile in your WPF or Silverlight applications using a User Control. With just a little bit of XAML and a little bit of code-behind you can create a navigation system like that shown in Figure 1. Figure 1: Use a Tile for navigation. You can build a Tile User Control with just a little bit of XAML and...(read more)

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Unity throws SynchronizationLockException while debugging

- by pjohnson

I've found Unity to be a great resource for writing unit-testable code, and tests targeting it. Sadly, not all those unit tests work perfectly the first time (TDD notwithstanding), and sometimes it's not even immediately apparent why they're failing. So I use Visual Studio's debugger. I then see SynchronizationLockExceptions thrown by Unity calls, when I never did while running the code without debugging. I hit F5 to continue past these distractions, the line that had the exception appears to have completed normally, and I continue on to what I was trying to debug in the first place.In settings where Unity isn't used extensively, this is just one amongst a handful of annoyances in a tool (Visual Studio) that overall makes my work life much, much easier and more enjoyable. But in larger projects, it can be maddening. Finally it bugged me enough where it was worth researching it.Amongst the first and most helpful Google results was, of course, at Stack Overflow. The first couple answers were extensive but seemed a bit more involved than I could pull off at this stage in the product's lifecycle. A bit more digging showed that the Microsoft team knows about this bug but hasn't prioritized it into any released build yet. SO users jaster and alex-g proposed workarounds that relieved my pain--just go to Debug|Exceptions..., find the SynchronizationLockException, and uncheck it. As others warned, this will skip over SynchronizationLockExceptions in your code that you want to catch, but that wasn't a concern for me in this case. Thanks, guys; I've used that dialog before, but it's been so long I'd forgotten about it.Now if I could just do the same for Microsoft.CSharp.RuntimeBinder.RuntimeBinderException... Until then, F5 it is.

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Local Entities with NHibernate

- by Ricardo Peres

You may know that Entity Framework Code First has a nice property called Local which lets you iterate through all the entities loaded by the current context (first level cache). This comes handy at times, so I decided to check if it would be difficult to have it on NHibernate. It turned out it is not, so here it is! Another nice addition to an NHibernate toolbox! public static class SessionExtensions { public static IEnumerable<T> Local<T>(this ISession session) { ISessionImplementor impl = session.GetSessionImplementation(); IPersistenceContext pc = impl.PersistenceContext; foreach (Object key in pc.EntityEntries.Keys) { if (key is T) { yield return ((T) key); } } } } //simple usage IEnumerable<Post> localPosts = session.Local<Post>(); SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/2.0.320/scripts/clipboard.swf'; SyntaxHighlighter.brushes.CSharp.aliases = ['c#', 'c-sharp', 'csharp']; SyntaxHighlighter.all();

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Service Testing made easy with SO-Aware Test Workbench

- by cibrax

I happy to announce today a new addition to our SO-Aware service repository toolset, SO-Aware Test Workbench, a WPF desktop application for doing functional and load testing against existing WCF Services. This tool is completely integrated to the SO-Aware service repository, which makes configuring new load and functional tests for WCF Soap and REST services a breeze. From now on, the service repository can play a very important role in an organization by facilitating collaboration between developers and testers. Developers can create and register new services in the repository with all the related artifacts like configuration. On the other hand, Testers can just pick one of the existing services in the repository and create functional or load tests from there, with no need to deal with specific details of the service implementation, location or configuration settings. Developers and Testers can later use the result of those tests to modify the services or adjust different settings on the tests or service configuration. Gustavo Machado, one of the developers behind this project, has written an excellent post describing all the functionality that can find today in the tool. You can also see the tool in action in this Endpoint Tv episode with Jesus and Ron Jacobs.

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What if we run out of stack space in C# or Python?

- by dotneteer

Supposing we are running a recursive algorithm on a very large data set that requires, say, 1 million recursive calls. Normally, one would solve such a large problem by converting recursion to a loop and a stack, but what if we do not want to or cannot rewrite the algorithm? Python has the sys.setrecursionlimit(int) method to set the number of recursions. However, this is only part of the story; the program can still run our of stack space. C# does not have a equivalent method. Fortunately, both C# and Python have option to set the stack space when creating a thread. In C#, there is an overloaded constructor for the Thread class that accepts a parameter for the stack size: Thread t = new Thread(work, stackSize); In Python, we can set the stack size by calling: threading.stack_size(67108864) We can then run our work under a new thread with increased stack size.

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VS 2010: New Add Reference dialog, tab layout and options

- by Fabrice Marguerie

Microsoft has just published a new free extension for Visual Studio 2010 that provides an improved Add Reference dialog, an improved tab bar, and much more.The new Add Reference dialog comes with a long-awaited feature: it's now searchable!The tab bar allows you to display the close button at the end of the bar and not on each tab. It can also sort tabs by project and alphabetically. Tab color can vary by project or according to regular expressions.I'll let you discover about the other features by yourself (HTML Copy, Triple Click, Current Line Highlighting, etc.).The name of the extension is Visual Studio Pro Power Tools. I believe it's main features will come out-of-the-box with the next version of Visual Studio.

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Yet Yet Another Way To Create An Object

- by Ricardo Peres

Yep, there's still another one: FormatterServices. This one allows one to create an object without running it's constructor... it is used by some of our good friends serializers. Stopwatch watch = new Stopwatch(); for (Int32 i = 0; i Beware, though: because the constructor isn't run (and remember that all fields that are initialized inline are also in fact initialized in the constructor), the object's state may be invalid. Enough object construction for now... SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/2.0.320/scripts/clipboard.swf'; SyntaxHighlighter.brushes.CSharp.aliases = ['c#', 'c-sharp', 'csharp']; SyntaxHighlighter.all();

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Saving user details on OnSuspending event for Metro Style Apps

- by nmarun

I recently started getting to know about Metro Style Apps on Windows 8. It looks pretty interesting so far and VS2011 definitely helps making it easier to learn and create Metro Style Apps. One of the features available for developers is the ability to save user data so it can be retrieved the next time the app is run after being closed by the user or even launched from back suspended state. Here’s a little history on this whole ‘suspended’ state of a Metro Style app: Once the user say, ‘alt+tab...(read more)

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Good article on REST

- by gregarobinson

I need to get up to speed on REST as one of the vendors we are working with is using REST in their web service architecture. I found a great intro article on REST here.

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