Prevent Browser From Closing In Asp.net

I am using asp.net 2.0 with c#. i want a pop up to be displayed when user tries to close the browser and if user click on 'no' [i.e. he don't want browser to be closed] then it pre

Solution 1:

the code they use is

window.onbeforeunload=function() {
  if (somereasonorother) return"You did not save your stuff"
}

Solution 2:

Pointy, this is entirely possible, and it's done by many web pages for perfectly reasonable reasons.

Try something like this:

functionareYouSure() {
    return"Are you sure you want to leave this page?";
}
window.onbeforeunload = areYouSure;

Solution 3:

You can try to attach yourself to the onbeforeunload event:

<bodyonbeforeunload="ConfirmClose();">

But I have to mention that it won't work on all browsers. The only ones that prompted something after I closed a window were Chrome, Firefox and Internet Explorer; Opera ignored the code in the JavaScript method.

This is mostly because some browsers trigger the onbeforeunload event only when you're trying to leave the current page by visiting another one, and not when you close the current window / tab.