private void btnGiveOrder_Click(object sender, EventArgs e)
        {
            Orders orders = new Orders();

            orders.ProductId = id;
            orders.BillId    = int.Parse(lblBillID.Text);
            orders.Quantity  = int.Parse(cmbQuantity.SelectedItem.ToString());
            orders.Price     = double.Parse(lblPrice.Text);

            var result = orderBLL.ADD(orders);

            DecreaseQuantity();

            if (result != 0)
            {
                MessageBox.Show("Data inserted succesfully!!!");
                this.Close();
            }
            else
            {
                MessageBox.Show("Insert / FAil");
            }
        }