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OnbeforeUpload event not firing in chrome

Last Modified: 2018-01-30
I am using asp.net page, I have called following java script event:
  window.onbeforeunload = doUnload;
      function doUnload() {
                if (!isClose) {
              document.getElementById('<%=btnClose.ClientID %>').click();

So what I am trying to achieve is that if user close that page then I want to store some value in database,that's why I have fired button click event. This is working fine on IE11 but not working on chrome, Can you please tell me solutions to fix my problem asap.

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