List<string> switches = new List<string>();
 switches.Add("-dBATCH");
 switches.Add("-dSAFER");
 switches.Add("-dNOPAUSE");
 switches.Add("-q");
 switches.Add("-sDEVICE=pdfwrite");
 switches.Add("-sOutputFile=" + outputFileName+".pdf");
 switches.Add("-c");
 switches.Add("-f");
 switches.Add(outputFileName);
 // create a new instance of the GhostscriptProcessor
 using (GhostscriptProcessor processor = new GhostscriptProcessor())
 {
 // start processing pdf file
 processor.StartProcessing(switches.ToArray(), null);
 }