public string RegisterNewUser(string userName, string password)
        {
            USER user = new USER();
            user.Login = userName;
            user.Password = password;

            if(_proxy.AddNewUserToDatabase(user))
                return "User has been added";
            return "User has not been added";
        }
 partial void UpdateUSER(USER instance);
 partial void DeleteUSER(USER instance);
 partial void InsertUSER(USER instance);