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Application state variables are global, and all sessions have access to them. So, these variables can be used to track the number of users online.
Every time a new user connects to your application, we want to increase the number of users online by 1. Along, the same lines, when ever a user session ends, then we need to decrease the number of users online by 1.
But how do we know, when a new user connects to our application. Session_Start() event is fired when ever a new session is established. When the session ends, Session_End() event is fired. The event handlers are in global.asax file.
By default, the browser instances share the session cookie. To have a new session id assigned, when a new browser instance requests the webform, set cookieless"true" for the sessionstate element in web.config.