WPF Вывод второй формы или окна

Form2Pop.cs

//В WPF
private void Button_Click(object sender, RoutedEventArgs e)
{
   newWindow nw = new newWindow();
   nw.ShowDialog();
}

//В Windows Forms
private void button1_Click(object sender, EventArgs e)
{
  using (Form2 f = new Form2())
  {
   f.ShowDialog();
  }
}