Back button and refresh buttton disable

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C#

I want to redirect the error page when user clicks the back button and refresh button.

I find the solution but it is not working.

Here is my solution:

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

        if (Page.IsPostBack)
        {
            if (isPageExpired())
            {
                Response.Redirect("expired.htm");
            }
            else
            {
                Session["TimeStamp"] = DateTime.Now.ToString();
                ViewState["TimeStamp"] = DateTime.Now.ToString();
            }
        }
 private Boolean isPageExpired()
    {
        if (Session["TimeStamp"] == null ||
           ViewState["TimeStamp"] == null)
            return false;
        else if (Session["TimeStamp"] == ViewState["TimeStamp"])
            return true;
        else
            return false;
    }

and

javascript: window.history.forward(1);

Help me.