How to manipulate back button in ASP.NET 4?

After searching a lot of references. I have came to a conclusion that you can only prevent user from accessing the previous page is thru javascript window history. You can not manipulate the forward button but only the back button. There are many ways to do it, if you really want to manipulate both button is to clear cache like this,
Response.Buffer = true;
Response.ExpiresAbsolute = DateTime.Now.AddDays(-1);
Response.Expires = 0;
Response.CacheControl = “no-cache”;

To manipulate the previous page (back button) is thru this way,

<script type="text/javascript" language="javascript">
function DeleteHistory() {
window.history.go('Default.aspx');
}
setTimeout("DeleteHistory()", 1000);
window.onunload = function () { DeleteHistory(); };
</script>

Here are references that I have used:
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Javascript back button asp.net
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