Why printing pdf file silently is not working in a windows service C#?

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C#

I am unable to print file silently via a windows service. If I am running the print function in the initialisecomponent() event of the service printing works fine.

Windows service is having 3 minutes interval. I have attached the windows service hosted and tried debugging. Then also print is not working. File is generated successfully.

My code is as below:

#region SendPDFToPrinter
       //Added on 17.06.2016  for printing PDF silently
       public void SendPDFToPrinter(string pathPdf)
       {
           try
           {
               ProcessStartInfo infoPrintPdf = new ProcessStartInfo();
               //pathPdf = @"D:\ITC.pdf";
               infoPrintPdf.FileName = pathPdf;
               // The printer name is hardcoded here, but normally I get this from a combobox with all printers
               string printerName = System.Configuration.ConfigurationManager.AppSettings["PrinterName"].ToString();
               //string printerName = "HP LaserJet Professional P1606dn";
               string driverName = System.Configuration.ConfigurationManager.AppSettings["DriverName"].ToString();
               string portName = System.Configuration.ConfigurationManager.AppSettings["portName"].ToString();
               infoPrintPdf.FileName = System.Configuration.ConfigurationManager.AppSettings["AcrobatExePath"].ToString();
               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
           }
           catch (Exception ex)
           {

           }


       }
       //End
       #endregion

What I have tried:

My code is as below:
#region SendPDFToPrinter
//Added on 17.06.2016 for printing PDF silently
public void SendPDFToPrinter(string pathPdf)
{
try
{
ProcessStartInfo infoPrintPdf = new ProcessStartInfo();
//pathPdf = @"D:\ITC.pdf";
infoPrintPdf.FileName = pathPdf;
// The printer name is hardcoded here, but normally I get this from a combobox with all printers
string printerName = System.Configuration.ConfigurationManager.AppSettings["PrinterName"].ToString();
//string printerName = "HP LaserJet Professional P1606dn";
string driverName = System.Configuration.ConfigurationManager.AppSettings["DriverName"].ToString();
string portName = System.Configuration.ConfigurationManager.AppSettings["portName"].ToString();
infoPrintPdf.FileName = System.Configuration.ConfigurationManager.AppSettings["AcrobatExePath"].ToString();
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
}
catch (Exception ex)
{

}


}
//End
#endregion