Build a Web Chat Application Part 2 - Chat with Other Users Privately (in C# 3.5)

In Part 1 we built a very simple, flicker-free, frame-less, web chat application using ASP.Net 3.5, LINQ-to-SQL, AJAX and MS SQL Server, with your choice of either C# 3.5 or VB 9.0 in about 2 hours. As promised, we will add functionality to our previous chatroom application so that users will have the ability to chat with each other privately. ...