protected void Page_Load(object sender, EventArgs e) { if (Session[Constant.SESSION_USERID] != null) { UpdateUserLoginStatus(Session[Constant.SESSION_USERID].ToString(), 0, Session.SessionID.ToString()); } FormsAuthenticationHelper.SignOutAndRedirectToLogin(); //Response.Buffer= true; //Response.ExpiresAbsolute=DateTime.Now.AddDays(-1d); //Response.Expires =-1500; //Response.CacheControl = "no-cache"; //Response.AppendHeader("Refresh", "1; URL=login.aspx"); //RegisterStartupScript("disableback", "<script language='text/javascript'><!-- javascript:window.history.forward(1); //--></script>"); }