The type or namespace does not exist

Question

Ok, I have had this one a million times before and it\'s been answered 1 million +1 times before.

And yet, once again. I have 3 projects, A, B, and C, each a DLL. Each

Answer 1

Basically, this sounds like a missing reference.

Some sanity checks I can think of are:

1. Are you sure that the project that generates the error is C?
2. Are you sure you are did not make a spelling mistake in the namespace B in your using?
3. Can there have been some compilation error in B before compiling C? (That may cause the compiler to fail finding the namespace in B).
4. Do you have any other compilation error or warning?

Edit

Another suggestion: is the class in the B assembly defined as public?