How to prevent page going back on backspace button click

Stop page going back on backspace button click in asp.net,C#,java,PHP.

1. To prevent page going back on backspace or browser back button. you can achieve this by short snippet by javascript below.

<script type="text/javascript">
function preventBack() 
{ 
    window.history.forward(); 
}
setTimeout(function () { preventBack() }, 0);
window.onunload = function () { null };
</script>

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