private void button_Click(object sender, RoutedEventArgs e)
        {
            var choosedialog = new ChooseFileDialog();

            choosedialog.Owner = this;
            choosedialog.Show();
        }
 private void button_Click(object sender, RoutedEventArgs e)
 {
     var choosedialog = new ChooseFileDialog();
     choosedialog.Owner = this;
     choosedialog.Show();
 }