Debugging error “The Type 'xx' is defined in an assembly that is not referenced”

Question

The full error is as follows:

The type \'System.Windows.Forms.Control\' is defined in an assembly that is not referenced. You must add a reference to assembl

Answer 1

Use something like NDepend or Reflector or the Object Browser to check the dependencies of the assemblies you depend on.

I cannot think of any other way given the info above.