//Service User

        public User CheckPassword(string name, string password)
        {
            User user = userDao.GetUser(name);

            if (user == null)
            {
                return(null);
            }
            if (user.Password != password)
            {
                return(null);
            }
            cardDao.UpdateActive();
            paymentDao.UpdateOldPayments();
            return(user);
        }