protected void btnLuuNhaO_Click(object sender, EventArgs e)
        {
            string s = Session["ThaoTac"].ToString();

            if ((ThaoTac)Session["ThaoTac"] == ThaoTac.ThemMoi)
            {
                bool kq = don.ThemNhaODuBi(Session["MaDon"].ToString(), drLoaiNhaO.Text, txtDienTichXayDung.Text, txtDienTichSan.Text, txtKetCau.Text, txtSoTang.Text, txtSoHuuChung.Text, txtSoHuuRieng.Text, drHanCheNha.SelectedValue, txtHanCheNha.Text);
            }
            else if ((ThaoTac)Session["ThaoTac"] == ThaoTac.DangSua)
            {
                bool kq = don.SuaNhaODuBi(lblMaNhaO.Text, drLoaiNhaO.Text, txtDienTichXayDung.Text, txtDienTichSan.Text, txtKetCau.Text, txtSoTang.Text, txtSoHuuChung.Text, txtSoHuuRieng.Text, drHanCheNha.SelectedValue, txtHanCheNha.Text);
            }
            LoadgrvNhaO();
            Session["ThaoTac"] = ThaoTac.KhongNhap;
            ApDungTrangThai();
        }