Unable to find the requested .Net Framework Data Provider. It may not be installed. - when following mvc3 asp.net tutorial

Question

I am following the ASP.NET MVC 3 Music store application tutorial but I keep getting stuck in part 4: http://www.asp.net/mvc/tutorials/mvc-music-store-part-4. It keeps telli

Answer 1

In my case, the issue was caused by a connection problem to the SQL database. I just disconnected and then reconnected the SQL datasource from the design view. I am back up and running. Hope this works for everyone.

Answer 2

I had a similer problem with SqlClient on WCF service. My solution was to put that lines in client app.config

  <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
  </startup>

Hopes it helps for someone..