The followign demo shows one approach you can take: http://demos.telerik.com/aspnet-ajax/notification/examples/sessiontimeout/defaultcs.aspx. The demo description section explains the core functionality and can help you get it easily into you project without the eye candy of the demo, as most of the code you will see there relates to timers and UX. The key thing is to:
- update the notification when the session is renewed (usually by adding the update panel)
- set the ShowInterval of the notification to make it pop-up a bit before the session expires.
You can, of course, do this with simple setTimeout or setInterval calls without RadNotification and its events.
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