private void btnTallenna_Click(object sender, RoutedEventArgs e) { // Valittu Book -olio tallennetaan kantaan try { Book current = (Book)spBook.DataContext; BookShop.UpdateBook(current); MessageBox.Show(string.Format("Kirja {0} päivitetty kantaan onnistuneesti", current.ToString())); } catch (Exception ex) { MessageBox.Show(ex.Message); } }