public void OrderSave(OrderClass aOrderClass)
        {
            connect.Open();
            string     insertQuery = string.Format("INSERT INTO OrderInfo VALUES({0},{1},{2},{3},{4},'{5}')", aOrderClass.Cust_ID, aOrderClass.Item_ID, aOrderClass.Quantity, aOrderClass.Unit_Price, aOrderClass.Bill, aOrderClass.Date);
            SqlCommand comm        = new SqlCommand(insertQuery, connect);

            comm.ExecuteNonQuery();
            connect.Close();
        }
        private void saveButton_Click(object sender, EventArgs e)
        {
            if (qtyTextBox.Text == "" || unitPriceTextBox.Text == "" || billTextBox.Text == "")
            {
                MessageBox.Show("Field value is missing", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            OrderClass        aOrderClass        = new OrderClass();
            OrderGatewayClass aOrderGatewayClass = new OrderGatewayClass();

            aOrderClass.Cust_ID    = Convert.ToInt32(customer_comboBox.SelectedValue);
            aOrderClass.Item_ID    = Convert.ToInt32(item_ComboBox.SelectedValue);
            aOrderClass.Quantity   = Convert.ToInt32(qtyTextBox.Text);
            aOrderClass.Unit_Price = Convert.ToInt32(unitPriceTextBox.Text);
            aOrderClass.Bill       = Convert.ToInt32(billTextBox.Text);
            aOrderClass.Date       = Convert.ToDateTime(txt_Date.Text);

            aOrderGatewayClass.OrderSave(aOrderClass);
            //reset();
            MessageBox.Show("Data Saved", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }