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I’m trying to determine how much time is left in a given ASP.NET session until it times out.
If there is no readily available time-to-timeout value, I could also calculate it from its last access time (but I didn’t find this either). Any idea how to do this?
If you are at the server, processing the request, then the timeout has just been reset so the full 20 minutes (or whatever you configured) remain.
If you want a client-side warning, you will need to create some javascript code that will fire about 20 minutes from “now”. See the setTimeout method.
I have used that to display a warning, 15 minutes after the page was requested. It pops up an alert like “your session will expire on {HH:mm}, please save your work”. The exact time was used instead of “in 5 minutes” as you never know when the user will see that message (did he return to his computer 10 minutes after the alert fired?).