The type or namespace name 'Entity' does not exist in the namespace 'System.Data'
Right-click on the Solution from the Visual Studio Solution Explorer click the Manage Nuget packages for solution and install the EntityFramework
Hi this post is very misleading, if your reading this 2 years on.
With using EF6 and .net 4.5.1 in VS 2013 I have had to reference the following to get this to work
using System.Data.Entity.Core.EntityClient;a little different to before,
this is more of a FYI for people that come here for help on newer problems than a answer to the original question
Thanks every body! I found the solution. not that I understand why but I tried this and it worked!I just had to add a reference to: System.Data.Entity.Designand don't have to write any using in the code.Thanks!