Is this a bad example for displaying timeout?

I'm looking for an example to display to the user that their session is being expired. Click ok to stay on the page. It should display a counter as well.

I found this
http://blog.oscarscode.com/dot-net/display-session-timeout-warning-with-asp-net-ajax/

but one of the comments says it's a bad example because the timeout session is read from an appsetting. I thought that at first too when I saw this example.

Any other examples I can use?
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CamilliaAsked:
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Dave BaldwinFixer of ProblemsCommented:
The problem with AJAX is that accessing the server resets the timeout.  If that page sits there and continuously makes request, the session may never timeout.
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GaryCommented:
Nothing wrong with the example, there is no Ajax and the appsetting is only accessed at page load.
So it will work fine.

Though are better ways of maintaining session rather than reloading the page.
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CamilliaAuthor Commented:
any other examples?
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GaryCommented:
A better example that extends what you have but allows for staying on the page without refreshing the page.
http://www.codeproject.com/Articles/227382/Alert-Session-Time-out-in-ASP-Net
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CamilliaAuthor Commented:
Thanks, Gary
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