How to solve problem while upgrade to EF6: System.InvalidOperationException: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'

To solve this problem for me is to add EntityFramework.SqlServer.dll into project reference:

System.InvalidOperationException: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'

How to add Facebook comment in ASP.NET MVC project?

You can download solution on Github by

https://github.com/raysaspnet/facebookcomment

1. Create a partial view, call fbComment

2. Add this partial view into any view for comments

@RenderBody()
        
@Html.Partial("fbComment")
    

https://developers.facebook.com/docs/plugins/comments

The case-insensitive regular expression for Canada postal code

^[abceghjklmnprstvxyABCEGHJKLMNPRSTVXY]\d[a-zA-Z]\d[a-zA-Z]\d$

How to display Textbox input to upper case in ASP.NET MVC razor view?

1. Create css class
.uppercase
{
text-transform: uppercase;
}

2. Add this class into Textbox in razor view
@Html.TextBoxFor(model => model.PostCode, new { @class = "uppercase" })

Note: the value still keeps original value.

How to write Singleton pattern in C#?

http://msdn.microsoft.com/en-us/library/ff650316.aspx

using System;

public sealed class Singleton
{
   private static volatile Singleton instance;
   private static object syncRoot = new Object();

   private Singleton() {}

   public static Singleton Instance
   {
      get 
      {
         if (instance == null) 
         {
            lock (syncRoot) 
            {
               if (instance == null) 
                  instance = new Singleton();
            }
         }

         return instance;
      }
   }
}