static void Main(string[] args)
{
Customer zhangchao = new Customer("220104198905121316", "Zhangchao");
zhangchao.Register(zhangchao.Id, zhangchao.Name);
zhangchao.Save(zhangchao.Id, 200);
zhangchao.Save(zhangchao.Id, 40);
zhangchao.closeAccount(zhangchao.Id, zhangchao.Name);
Console.ReadKey();
}