pdf to direct print

private void SendToPrinter()
  {
  ProcessStartInfo info = new ProcessStartInfo();
  info.Verb = "print";
  info.FileName = @"C:\pdf.pdf";
  info.CreateNoWindow = true;
  info.WindowStyle = ProcessWindowStyle.Hidden;

  Process p = new Process();
  p.StartInfo = info;
  p.Start();

  p.WaitForInputIdle();
   System.Threading.Thread.Sleep(3000);
  if (false == p.CloseMainWindow())
  p.Kill();
  }