run asp.net function when The page is closing
<p>I have an asp.net page 
when Loading this page it creates a Thread to do some thing
My Question is :
How to kill this thread when the user close the page ?
I have tried with "onUnload" event
but it just works with javascript function (as I know)
and we can't use asp.net code in javascript function
Do You have a way to help me ...
thanks a lot</p>

<p><strong>Edit:</strong>
It 's difficult to explain what I am Trying to do.. The asp.net page must show a message to the user and this message must appear directly without refreshing so I was trying to use a thread which listen wait the message and then run an AJAX code to show the message ..</p>
