using System.Windows; namespace WPF_9_MessageBox; /// /// Interaction logic for MainWindow.xaml /// public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void FireButton_OnClick(object sender, RoutedEventArgs e) { var result = MessageBox.Show("You Message Here.", "Error", MessageBoxButton.YesNo, MessageBoxImage.Question); InfoTextBlock.Text = result == MessageBoxResult.Yes ? "Agree" : "Not Agree"; } }