public void RemoveBookItem(PhoneBook phoneBook)
        {
            if (phoneBook == null)
                return;

            _phoneBookRepository.Remove(phoneBook);
        }
        public void UpdateBookItem(PhoneBook phoneBook)
        {
            if (phoneBook == null)
                return;

            _phoneBookRepository.Update(phoneBook);
        }
        public void AddBookItem(PhoneBook phoneBook)
        {
            if (phoneBook == null)
                return;

            _phoneBookRepository.Add(phoneBook);
        }