//构造函数
public CouponForm(BathDBDataContext dc, Coupon coupon)
{
db = dc;
if (coupon != null)
{
newCoupon = false;
m_Coupon = coupon;
}
InitializeComponent();
}
partial void UpdateCoupon(Coupon instance);
partial void DeleteCoupon(Coupon instance);
partial void InsertCoupon(Coupon instance);