protected void Page_Load(object sender, EventArgs e)
        {
            if (Session["UserPrivilegeId"] == null)
            {
                Response.Redirect("/");
            }
            if (Session["UserPrivilegeId"].ToString() != "0" && Session["UserPrivilegeId"].ToString() != "1")
            {
                Response.Redirect("/");
            }

            if (!this.IsPostBack)
            {
                function.GetListLevel(txtLevel, int.Parse(Session["UserPrivilegeId"].ToString()));
                BindData();
            }
        }