c# Multimedia

Question

Hi,
I am planning to write a program that will allow two users on different machines be able to have video + audio communication with each other. I want to write this program in C# but I cant find any good resource like a book or something that can help me out in multimedia with C#.
Please help me out here, I need a reference to a good book or any other resource that can help me in all multimedia aspects of C#.

Thanks in advance.