Detect if browser closed by Task Manager uusing asp.net

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If user trying to close browser via windows task manager.. i need to perform some action before kill that web page or browser.. How can we achieve it using asp.net with VB.
with thanks,
Gopinath Ganesan

Posted 5-Apr-12 8:35am

Member 8310151

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ZurdoDev · Answer 1 · 2012-04-05T08:40:00

You can't with VB. VB and ASP.Net run on the server side so it has no way of knowing that a client has closed its browser. You can do some things on client side using the window.close() event in javascript.

JavaScript

// wire up event to fire when closing window
window.onbeforeunload = WindowIsClosing;

function WindowIsClosing() {
  if (window.event.clientX < 0 || window.event.clientY < 0) {
// do your own logic, but for example:
        if (!Validate()) {
            var msg = 'Test';
            event.returnValue = msg;
            return msg;
        }
    }
}