/// <summary>
        ///
        /// </summary>
        void Grade_bind()
        {
            ROYcms.Sys.BLL.ROYcms_UserGrade bll = new ROYcms.Sys.BLL.ROYcms_UserGrade();
            this.txtGradeID.Items.Add(new ListItem("选择会员等级", ""));
            DataSet ds = bll.GetAllList();

            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                string Id   = dr["Id"].ToString().Trim();
                string Name = dr["GradeName"].ToString().Trim();
                this.txtGradeID.Items.Add(new ListItem(Name, Id));
            }

            int UserId  = Convert.ToInt32(ViewState["UserId"]);
            int GradeID = Bll.GetModel_(UserId) == null ? 0 : Bll.GetModel_(UserId).GradeID;

            if (GradeID > 0)
            {
                this.txtGradeID.SelectedValue = GradeID.ToString();
            }
            else
            {
                this.txtGradeID.SelectedValue = "";
            }
        }