Preventing the use of backbutton in asp.net

We can use the javascript code below  to prevent the use of backbutton in asp.net webpages.

<script type="text/javascript">

function noBack(){window.history.forward();}

noBack();

window.onload=noBack;

window.onpageshow=function(evt){if(evt.persisted)noBack();}

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

</script>