how to integrate a help file into WPF application

private void button1_Click(object sender, RoutedEventArgs e)
        {



           //System.Diagnostics.Process.Start(@"C:\Users\rajan\Desktop\MyApartmentManager\buthelp");
            System.Windows.Forms.Help.ShowHelp(null, @"C:\Users\rajan\Desktop\MyApartmentManager\buthelp.chm");
        }