How to use class from other files in C# with visual studio?

Question

I am a newbie of C# and MS visual studio, and I want to use the C# class which defined in another file, but can\'t get it work.

Here is the program.cs

Answer 1

Yeah, I just made the same 'noob' error and found this thread. I had in fact added the class to the solution and not to the project. So it looked like this:

Just adding this in the hope to be of help to someone.