Correctly Identify the sender of a chat message in ASP.NET

I am developing a chat application using VB.NET and ASP.NET and I need to identify the particular user name users post message开发者_JAVA百科s. At present, it just shows my name, even for messages I haven't posted.

What am I doing wrong?

The process running on the server is likely to run on your account. You need users to login to your chat application.

Do you have a login page on your chat? How does it work?

Here are some posibiloties to start with: Try to use membershi api http://msdn.microsoft.com/en-us/library/ms998347.aspx or login through

Use OpenId. (As is used here, when you login to Stack Overflow)