protected void btnLuuKH_Click(object sender, EventArgs e)
        {
            DTOLoaiKH dtoLKH = new DTOLoaiKH();
            dtoLKH.TenLKH = txtTenLKH.Text;

            DAO_Entity daoLKH = new DAO_Entity();
            if (KiemTraNhap() == "")
            {
                daoLKH.ThemLoaiKH(dtoLKH);
                Response.Redirect("~/QLBophan_Admin/QLCauHinhLoaiKH/LoaiKH.aspx");
            }
            else
            {
                ThemLoaiKH.Visible = true;
                lbLoi.Text = KiemTraNhap();
            }

        }