Session end event

[Varchas]

How does one try to catch the session end event? Do I have to make any web configuration settings in order to do so?

[Plater]

Check the Global.asax file

void Session_End(object sender, EventArgs e) 
{
// Code that runs when a session ends. 
// Note: The Session_End event is raised only when the sessionstate mode
// is set to InProc in the Web.config file. If session mode is set to StateServer 
// or SQLServer, the event is not raised.
}