How do mix VB and C#?

Probably not specifing the namespace properly.

I still have a problem. I have both projects in one solution, and have added the reference of the c# class library to the VB GUI, but I can't access the different functions in the c# class. What am I doing wrong? Thanks in advance.

As long as we're talking about VB.Net (and not VB 6.0) you can interchange the compiled code seamlessly. If you have a solution opened in VS.Net, you can add two projects, one a VB.Net app and one a C# class library, and they can work together as if they were the same. Simply make a reference from one project to the other. -James