The type 'System.Data.Entity.DbContext' is defined in an assembly that is not referenced. You must add a reference to assembly 'EntityFramework 2

Question

I\'ve got one solution - the one project is class library with .edmx data model The other is asp.net web forms project.

when i start the solution I get the following e

Answer 1

I already had the correct version of the entity framework DLL, and none of the other answers here worked for me: I had to select the EntityFramework reference in the project, then in the properties, set "Specific Version" to true.