private void AddBookButton_Click(object sender, RoutedEventArgs e)
{
if (ValidateBook())
{
_book = new Book();
_book.Title = BookTitleTextBox.Text.Trim();
_book.ISBN = BookIsbnTextBox.Text.Trim();
_book.ReleaseDate = PublishDatePicker.SelectedDate.Value;
_book.Publisher = PublisherTextBox.Text.Trim();
_book.Pages = int.Parse(PagesTextBox.Text);
_book.Genre = GenreTextBox.Text;
BookDataProvider.CreateBook(_book);
var newBookId = BookDataProvider.GetBookByIsbn(_book.ISBN);
_bookAuthor = new BookAuthor();
_bookAuthor.BA_AuthorId = _author.AuthorId;
_bookAuthor.BA_BookId = newBookId;
BookAuthorDataProvider.CreateBookAuthorLink(_bookAuthor);
DialogResult = true;
Close();
}
}