How can I use onUnload event on a asp.net page?

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I likt to use close event while closing my asp.net page, because there is a POSTBACK event on a Dropdownlist control in that page, when the page postback it will be closed.
onUnload event is just unload event ,not the closing event, I googled ,cant find result, can anyone who has this experience help me? or give me some suggestions.

Posted 22-Oct-11 17:55pm

chenghuichao

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Amir Mahfoozi · Answer 1 · 2011-10-22T20:17:00

You have access to this event on client side with help of javascript :

http://www.w3schools.com/jsref/event_onunload.asp[^]

do some AJAX actions in your javascript evenet handler to notify the server.

The other way that may not help you is Session_End in Global.asax file. but if you need an immediate reaction the javascript event handler is very suitable.