Question

I’m using VS10 and C# and I’ve encountered a weird problem. I have 2 project A and B, A is a class library, and B is a console project. B depends on A, so I added the project reference of A to B.

But when I use types created in project A in project B, VS complains the following:

The type or namespace name could not be found (are you missing a
using directive or an assembly reference?)

I’ve never encountered this problem before, does anyone know what went wrong?

Thanks.

Answer 1

Since you have Project B targetting Client Profile while the library is built for 4.0 this cannot be done.

You will have to upgrade the console app to target 4.0

MSDN

If you are targeting the .NET Framework 4 Client Profile, you cannot
reference an assembly that is not in the .NET Framework 4 Client
Profile. Instead you must target the .NET Framework 4.