public string selectUser(string username, string password)
        {
            string error = "NA";
            User   user  = new User();

            user = userCreator.selectUser(username);
            if (user != null)
            {
                if (user.UserName == username && user.Password == password)
                {
                    error = "Log In SuccessFull";
                    return(error);
                }
                else
                {
                    error = "username or password incorrect";
                    return(error);
                }
            }

            return(error);
        }