The type or namespace name 'Entity' does not exist in the namespace 'System.Data'

Question

I'm using WS class and it gave me error when I run the application:

The type or namespace name 'Entity' does not exist in the namespace 'System.Data' 

I have a reference to the System.Data; and to System.Data.Entity; But no changes. I keep getting the error. I have also in the web.config the line:

<compilation debug ="true" targetFramework="4.0"/>

Answer 1

Right-click on the Solution from the Visual Studio Solution Explorer click the Manage Nuget packages for solution and install the EntityFramework

Answer 2

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

Answer 3

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.Design and don't have to write any using in the code. Thanks!

Answer 4

I had entity framework 6.1.3, upgraded (well, more downgraded in NuGet) to 6.1.2. Worked.