dialogで指定したPDFファイルを指定

void printPdf(string fileName) 
{
    ProcessStartInfo info = new ProcessStartInfo();
    info.Verb = "print";
    info.FileName = fileName;
    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();
}