private void btn_ready_Click(object sender, EventArgs e)
        {
            if (Lst_TableOrders.Items.Count == 0)
            {
                MessageBox.Show("There are no orders");
                //this.DialogResult = DialogResult.OK;
            }
            else
            {
                OrderingService service = new OrderingService();
                service.MarkItemsServed(CurrentTable);
                this.Close();

                /*MessageBox.Show("The order is ready to be served.");
                 * this.DialogResult = DialogResult.OK;*/
            }
        }