protected void btnLuuTT_Click(object sender, EventArgs e)
        {
            

            DTOTrangThai dtott = new DTOTrangThai();
            dtott.TenTT = txtTenTT.Text;

            DAO_Entity daott = new DAO_Entity();

            if (KiemTraNhap() == "")
            {
                daott.ThemTT(dtott);
                Response.Redirect("~/QLBophan_Admin/QLCauHinhTrangThai/TrangThai.aspx");
            }
            else
            {
                ThemTT.Visible = true;
                lbLoi.Text = KiemTraNhap();
            }

        }