如何审核用户何时离开ASP.NET应用程序

In ASP.NET, I'm looking for a way to audit a user leaving my application. To be specific, I'd like to insert a 'logout' record in an audit table in SQL Server when the user's session is abandoned/destroyed for any reason (not necessarily because of a call to session.abandon)In ASP.NET, I'm looking for a way to audit a us