Disable browser back button using Javascript in ASP.NET

<script type="text/javascript">

       function DisableBack() {

           window.history.forward();

       }

       DisableBack();

       window.onload = DisableBack;

       window.onpageshow = function (evt) {

           if (evt.persisted) DisableBack();

       }

       window.onunload = function () { void (0); }

       

</script>