Ajax Control Toolkit

AJAX Control toolkit 3.5

DISABLING HISTORY IN A WEBSITE

Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetExpires(Now.AddSeconds(-1));
Response.Cache.SetNoStore();
Response.AppendHeader("Pragma", "no-cache");

--------------------------------------------------------

if (Page.IsPostBack)
{
if (pageIsExpired()){
Response.Redirect("/Some_error_page.htm");
}
else {
var now = Now;
Session("TimeStamp") = now.ToString();
ViewState("TimeStamp") = now.ToString();
}

private boolean pageIsExpired()
{
if (Session("TimeStamp") == null || ViewState("TimeStamp") == null)
return false;

if (Session("TimeStamp") == ViewState("TimeStamp"))
return true;

return false;
}