C# Threaded Discussion Forum Tutorial

Question

I have never created threaded discussion board or threaded discussion board to allow users to post comment , like how we are doing now post
a question and then someone reply.

can someone point me into the right direction. I want to do this in silverlight, can someone point me to good demo project. Or i cant create a simple project and post, and we can work on it from here so I see how to do it.