private void AddBook(object sender, EventArgs e) { Book book = new Book(); if (BookSubmission()) { book.ISBN = txtISBN.Text; book.Title = txtTitle.Text; book.Author = txtAuthor.Text; book.PubDate = Convert.ToInt32(txtPubDate.Text); book.Category = txtCategory.Text; if (LibraryHelper.IsBook(book)) { MessageBox.Show("There is a book in the " + "database with such a title. Please try again."); } else { LibraryHelper.AddBook(book); } } else { MessageBox.Show("Incorrect submission. " + "Please check your input."); } LoadBoxes(); }