How to print pdf silently in ASP.NET with C#?

private void print()
    {
        ProcessStartInfo infoPrintPdf = new ProcessStartInfo();
        string pathPdf = @"E:\eSAFE\FileStore\PDF\Account Statement_76876876878_040111_000018473018_20160620172958468.pdf";
        infoPrintPdf.FileName = pathPdf;
        // The printer name is hardcoded here, but normally I get this from a combobox with all printers
        string printerName = @"\\10.15.0.8\NTP Printer 001 SecondFloor";
        //string printerName = "HP LaserJet Professional P1606dn";
        string driverName = "hp1100sd.dll";
        string portName = "10.15.0.23";
        infoPrintPdf.FileName = @"C:\Program Files (x86)\Adobe\Reader 11.0\Reader\AcroRd32.exe";
        infoPrintPdf.Arguments = string.Format("/t {0} \"{1}\" \"{2}\" \"{3}\"",
            pathPdf, printerName, driverName, portName);
        infoPrintPdf.CreateNoWindow = true;
        infoPrintPdf.UseShellExecute = false;
        infoPrintPdf.WindowStyle = ProcessWindowStyle.Hidden;
        Process printPdf = new Process();
        printPdf.StartInfo = infoPrintPdf;
        printPdf.Start();

        // This time depends on the printer, but has to be long enough to
        // let the printer start printing
        System.Threading.Thread.Sleep(10000);

        if (!printPdf.CloseMainWindow())              // CloseMainWindow never seems to succeed
            printPdf.Kill(); printPdf.WaitForExit();  // Kill AcroRd32.exe

        printPdf.Close();  // Close the process and release resources

    }

private void print()
    {
        ProcessStartInfo infoPrintPdf = new ProcessStartInfo();
        string pathPdf = @"E:\eSAFE\FileStore\PDF\Account Statement_76876876878_040111_000018473018_20160620172958468.pdf";
        infoPrintPdf.FileName = pathPdf;
        // The printer name is hardcoded here, but normally I get this from a combobox with all printers
        string printerName = @"\\10.15.0.8\NTP Printer 001 SecondFloor";
        //string printerName = "HP LaserJet Professional P1606dn";
        string driverName = "hp1100sd.dll";
        string portName = "10.15.0.23";
        infoPrintPdf.FileName = @"C:\Program Files (x86)\Adobe\Reader 11.0\Reader\AcroRd32.exe";
        infoPrintPdf.Arguments = string.Format("/t {0} \"{1}\" \"{2}\" \"{3}\"",
            pathPdf, printerName, driverName, portName);
        infoPrintPdf.CreateNoWindow = true;
        infoPrintPdf.UseShellExecute = false;
        infoPrintPdf.WindowStyle = ProcessWindowStyle.Hidden;
        Process printPdf = new Process();
        printPdf.StartInfo = infoPrintPdf;
        printPdf.Start();

        // This time depends on the printer, but has to be long enough to
        // let the printer start printing
        System.Threading.Thread.Sleep(10000);

        if (!printPdf.CloseMainWindow())              // CloseMainWindow never seems to succeed
            printPdf.Kill(); printPdf.WaitForExit();  // Kill AcroRd32.exe

        printPdf.Close();  // Close the process and release resources

    }