Back button of asp.net page

Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);
        Response.AddHeader("pragma", "no-cache");
        Response.AddHeader("Cache-Control", "no-cache");
        Response.CacheControl = "no-cache";
        Response.Expires = -1;
        Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1);
        Response.Cache.SetNoStore();
 
         Page.ClientScript.RegisterStartupScript(this.GetType(), "cle", "windows.history.clear", true);

<script> 
function noBack(){window.history.forward();}
noBack();
window.onload=noBack;
window.onpageshow=function(evt){if(evt.persisted)noBack();}
window.onunload=function(){void(0);}
</script></script>

Response.Write("<script>window.top.navigate('../login.aspx')</script>");

<script language="JavaScript">

  javascript:window.history.forward(1);

</script>