如何在任何时候检索IIS上连接的用户数？

I want to know how many users are connected to the IIS web server at any point on a simple .net page. Is there a way using a native .net class in 3.5 that will tell me this information? I want to create a simple web page that will give me the total number of users/open sessions at a given time.I want to know how many users are connected to