private void CreateEdit(object sender, EventArgs e)
        {
            if (!CheckInputFields())
            {
                return;
            }

            if (_publisherToEdit == null)
            {
                var newPublisher = new Publisher
                {
                    Name = nameTextBox.Text,
                };

                _publishersRepository.Add(newPublisher);
            }
            else
            {
                _publisherToEdit.Name = nameTextBox.Text;
                _publishersRepository.Edit(_publisherToEdit);
            }

            Close();
        }