How can I find the time when a session was terminated? Is there any built in functionality in ASP.NET to find it? And if it is not, how can I find that event? The visitor can type another URL address in a browser, or select any site from ‘Favorites’ folder, or click on a button ‘Back’ several times to go to any previously visited page, or just close a browser from a menu, or click on ‘x’ button.