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

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!