Type or namespace cannot be found, when reference does exist

Question

I have a wpf Application in which I am trying to reference a class library i have created. I have added a reference to the .dll And i have added the using statement to my fi

Answer 1

The most common cause of this is that your .DLL targets the full .NET Framework, but the WPF Application targets the Client Profile.

For example, if your library targets .NET 3.5, make sure your WPF Application targets the full .NET 3.5 or 4.0 framework, not the client profile.