Browser Close Vs Session End in ASP.net

Browser Close Vs Session End in ASP.net

After a few R&D’s here goes my findings

There are n number of scenarios by which the browser can be closed viz

1. Clicking the (x) button
2. Clicking Alt+F4
3. File menu à Exit.
4. Alt+f+x

The OnUnload event will fire for all the above scenarios. So write a Javascript function like this which uses Remote scripting to Abandon the session in the Server side.

function abandonSession()
{
// Use remote scripting to
var xmlhttp;
if (window.ActiveXObject)
{ // IE
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.open("GET","AbandonSession.aspx",false);
xmlhttp.send();
}
}

Attach the above function in the HTML as shown below



In the page load of AbandonSession.aspx

protected void Page_Load(object sender, EventArgs e)
{
Session.Abandon();
// Write your code to logout the user since sometimes Session_End may not fire. Also Session_Event in Global.asax will not fire in Web farms.
}

However the weird thing is the OnUnload event also fires during following scenarios

1. When F5 or Page refresh is done
2. When the user types a different url in the same browser
3. Page is submitted or Post back happens
4. Click the browser back

So somehow you need to figure out a way which will not execute the abandonSession() function for all the above scenarios.