Fire event when user leaves a .aspx page

I need to fire an event when a user leaves a page.  I tried page unload, but fires even when the page loads.  I tried page dispose, but it does not fire at all.
I need to update the database in this event.
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gamarrojgqConnect With a Mentor Commented:

You have to understand that one thing are SERVER SIDE code and events, and another thing are CLIENTE SIDE code and events.

When you said that Page Unload fires even when the page loads it is because is the normal Page life cycle (look the link below)

So, if what you want is to call SERVER SIDE code and events, when the user Leaves/Close/Navigate to another page you have to do it in CLIENT SIDE code and events, using javascript  onbeforeunload event, where you can call a webservice to update your database.

But you cannot run SERVER SIDE code of the page the user is leaving since you will have to LOAD  that page again

Remember, it is possible for the user to suddenly lose their internet connection, their browser could crash, or switch off their computer using the big red switch. There will be cases where the server simply never hears from the browser again, so keep this in mind cause not always you will be able to reach the server when the user leaves a page
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