Print job in PDF error handling

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C#

VB

PDF

I am using a command line to operate a print job in VB.
For code I use

Dim appPath As String = "C:\Program Files\Adobe\Reader 10.0\Reader\AcroRd32.exe"
      Dim filepath As String = "pathToFile"
      Dim printerName As String = "\\PrintServer\name of the printer"
      Dim psi As New ProcessStartInfo(appPath, "/N " + "/T" + filepath + printerName)
      Process.Start(psi)

Usually this works great.
But sometimes it happens that a print job isn't printed.
I monitor every step of the process until my file gets printed.
My monitoring shows that everything is fine till I Run this process.
every file is send to the printer.
I don't get any errors if the file isn't printed.
Is there a way to check what is going wrong?

P.s. I can't use third party applications.

Thx in advance.