Hi tahamalik,

If you want to make a forum using asp.net, you can follow the link below which is a forum with the functionality similar to Code Project discussion board. It is done in C#, ASP.NET, SQL Server and JavaScript.

http://www.codeproject.com/Articles/16783/JumpyForum-Inspired-by-Code-Project-Forum-Discussi

In addition, you can try to use some opensource applications as follows:

http://yetanotherforum.net/

http://www.comm100.com/forum/hosting.aspx

Best wishes,