Can you mix .net languages within a single project? So pre-compiled, I would like to call classes and methods of other source files.
For both web and apps?
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You can do it in a web site project versus a compile-first project: http://www.aspnetlibrary.com/articledetails.aspx?article=Use-C-Sharp-and-VB.NET-in-the-same-project. A web site's BuildProvider resolves language elements on-the-fly.
.NET's BuilderProvider still isn't available for non-web site projects so you're out of luck for standard app mixed Intellisense.