private void DisplayDinnerPartyCost()
{
//首先就是如果是改变了health的box，并不会改变decoration
dinnerParty.CalculateCostOfDecorations(fancyBox.Checked);
decimal Cost = dinnerParty.CalculateCost(healthyBox.Checked) + dinnerParty.CostOfDecorations;
costLabel.Text = Cost.ToString("c");
}
private void DisplayDinnerPartyCost()
{
decimal Cost = dinnerParty.CalculateCost(healthyBox.Checked);
costLabel.Text = Cost.ToString("c");
}