how to handle show a meesage when users close from browser

mhd.sbt asked:

hi to all
i want to show a alert to users after close browser window.

you may say that use of unload or onunload event
but this event fire when my submit button in my form is clicked
and this alert show to them when form is submitted!!!!!
i want to show alert just close from browser.
how can i do this
thanks for any help

Tags: Javascript, ASP.NET

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