Child Window open from Parent window in wpf application

I am working in wpf application when i want to open the child window from Parent window button click. that time i am getting this solution. Just write Parent window click event method like this.

private void Button_Click(object sender, RoutedEventArgs e)
        {            
            window2 win2= new window2();
            win2.Show();
            this.Close();
        }