ASP.NET Forms Authentication. Determine if another user is online or not -


in asp.net mvc 5 web app, using formsauthentication, want determine if user still logged-in. doing users sign out clicking on log out button pretty straightforward - can handle event , set flag in database indicate user has signed out.

but not sure how handle users close browser without signing them off voluntarily (by clicking button).

i did research don't think can rely on session_end event handler. or can i?


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