private void cancel()
        {
            OrderGridView2.DataSource = null;
            OrderGridView2.Refresh();
            available = manager.getProductsData();
            AvailableGridView1.DataSource = available;
            added.Clear();

            AvailableGridView1.Refresh();
        }
        private void addButton_Click(object sender, EventArgs e)
        {
            Product p = available.ElementAt(AvailableGridView1.CurrentCell.RowIndex);

            if (p.Quantity > 0)
            {
                available.ElementAt(AvailableGridView1.CurrentCell.RowIndex).Quantity -= 1;
                added.Add(p);

                OrderGridView2.DataSource = added;
                OrderGridView2.Refresh();
                AvailableGridView1.Refresh();
                MakeMessage("Agregado");
            }
            else
            {
                MakeMessage("Producto no disponible.");
            }
        }