/// <summary>
/// Add Button 觸發事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void AddButtonClick(object sender, EventArgs e)
{
_orderDataGridView.Rows.Add(Constant.DELETE, _customerModel.GetSelectedMeal()._mealName, _customerModel.GetSelectedMeal()._mealPrice);
_customerModel.GetOrderList().Add(_customerModel.GetSelectedMeal());
_formData.SetTotalOrderListPrice(_customerModel.GetOrderList());
_totalLabel.Text = _customerPresentationModel.SetTotalPriceLabel(_formData);
}