private void PublisherEditButtonClick(object sender, EventArgs e)
 {
     if (string.IsNullOrEmpty(publisherNameTextBox.Text))
     {
         var errorForm = new ErrorForm("You need to fill al boxes");
         errorForm.ShowDialog();
     }
     else
     {
         var publisherToEdit = new Publisher
         {
             Name        = publisherNameTextBox.Text,
             PublisherId = SelectedPublisher.PublisherId,
             Books       = SelectedPublisher.Books
         };
         PublisherRepository.EditPublisher(publisherToEdit);
         Close();
     }
 }