>Thanks for your reply.
>
>I want the administrator able to see who already login and using the application. The administrator can terminate the user, who is using the application. This may change the value of the session. Can this be done by modifying the session stored in SQL Server? Or is there any better solution?

As I already said you can't do that. Session objects are not enumerable beyond the current session.

You can use Application_SessionStart and Application_SessionEnd to do your own tracking of users although I'll tell you that this likely will not be very accurate anyway unless your session timeout is very short.