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Detect Event Of Browser Close Button When [X] Is Clicked

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        Some times we need to detect the Browser Close to perform some operation before quiting from application. Here is a simple way. 

Call this Method From Body Unload 
function CheckBrowser()
     // Check Browser Close [X] , Alt+F4 , File -> Close  
     if(window.event.clientX < 0 && window.event.clientY <0)

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