private void btDelete_Click(object sender, EventArgs e)
        {
            DeleteRoomGoods del = new Hotel.DeleteRoomGoods();

            del.tbID.Text       = Common.StaticClass.choose1;
            del.tbRoomType.Text = Common.StaticClass.choose2;
            del.ShowDialog(this.Owner);
            this.Hide();
        }
        private void btDeleteRoomGoods_Click(object sender, EventArgs e)
        {
            DeleteRoomGoods del = new Hotel.DeleteRoomGoods();

            del.ShowDialog(this);
        }