How to print a windows form

public PrintingExample()
{
    PrintDocument PD = new PrintDocument();
    PD.PrintPage += new PrintPageEventHandler(PrintDocument_PrintPage);
    PD.Print();
}

private void PrintDocument_PrintPage(object sender, PrintPageEventArgs e)
{
    Bitmap Bmp = new Bitmap(this.DesktopBounds.Width,
                            this.DesktopBounds.Height);
    this.DrawToBitmap(Bmp, this.DesktopBounds);
    e.Graphics.DrawImage(Bmp, 0, 0);
}