private void DatPhong_GUI_Load(object sender, EventArgs e)
        {
            DataTable dtblp = new DataTable();

            dtblp = lpbl.dslp();
            cbloaiphong.DataSource    = dtblp;
            cbloaiphong.DisplayMember = "tenlp";
            cbloaiphong.ValueMember   = "tenlp";
            bindatalistphong();
            bindatadp();
        }