private void txtIDPhong_TextChanged(object sender, EventArgs e)
        {
            PhongDTO phongDTO = PhongBUS.GetPhongDTO(txtIDPhong.Text);

            if (phongDTO == null)
            {
                lblKhuNha.Text  = "";
                lblSoPhong.Text = "";
            }
            else
            {
                lblKhuNha.Text  = phongDTO.KhuNha;
                lblSoPhong.Text = phongDTO.SoPhong;
            }
            if (CheDoHienTai == CheDo.THEM)
            {
                if (!PhongBUS.KiemTraPhong(txtIDPhong.Text))
                {
                    lblNotSuitableRoom.Show();
                }
                else
                {
                    lblNotSuitableRoom.Hide();
                }
            }
            else
            {
                lblNotSuitableRoom.Hide();
            }
        }