Some times we need to detect the Browser Close to perform some operation before quiting from application. Here is a simple way.
function CheckBrowser()
{
if(window.event.clientX < 0 && window.event.clientY <0)
{
window.open("Operation.aspx",
"Operation",'left=12000,top=1200,width=10,height=1');
}
}
Call this Method From Body Unload