private void btn_modify_Click(object sender, EventArgs e)
{
FormModifyandAdd modifyForm = new FormModifyandAdd();
modifyForm.modifyInfo();
modifyForm.ShowDialog();
}
private void btn_add_Click(object sender, EventArgs e)
{
String info = Interaction.InputBox("请输入顾客姓名", "输入字符串", "", 100, 100);
Customer customer = new Customer(customerID++, info);
order = new Order(ID++, customer, DateTime.Now);
FormModifyandAdd formAdd = new FormModifyandAdd();
formAdd.addInfo(order);
Service.AddOrder(order);
formAdd.ShowDialog();
}