public void OnCreateUserButtonClick()
        {
            bool isCreated = _userRepository.CreateUser(_mainView.FirstName, _mainView.LastName);

            _mainView.AddUserToListBox(_userRepository.GetUser());

            _mainView.SetCreatedStatus(isCreated ? "Created" : "not created");

            _mainView.SetNumberOfCreatedUsers(_userRepository.GetCreatedUsersNumber());
        }