>Hello all, In my MVC app I would like to log ( in my database ) when the user opens the site and conversely closes it, I've managed to log when they open the site by putting code in the Application_Start() function but don't know where to put the log out code, I've tried the Application_End() but with erratic results ( i.e it sometimes fires ) where is the correct place to put the code ?

As Web applications can be disconnected easily without running close code I'd think about missed keep-alive pings (perhaps in addition to close code)