pdf file to image convert(user to ghostscript and gswin32.exe)

//pdf file to image convert(user to ghostscript and gswin32.exe)

            string ghostScriptPath = "\"" + System.Windows.Forms.Application.StartupPath + "\\gswin32.exe \"";
            string InputFileName = FileLocation.Replace("1.pdf", "watermark.pdf");
            string OutputFileName = @"Z:\1";

            PdfToImage(ghostScriptPath,InputFileName,OutputFileName );


 public void PdfToImage(string ghostScriptPath,string PdfFile,string ImageFile)
        {
                     
            String argu = "-dNOPAUSE -sDEVICE=jpeg -r400 -o" + ImageFile + "-%d.jpg " + PdfFile;
            System.Diagnostics.Process proc = new System.Diagnostics.Process();
            proc.StartInfo.FileName = ghostScriptPath;
            proc.StartInfo.Arguments = argu;
            proc.StartInfo.CreateNoWindow = true;
            proc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            proc.Start();
            proc.WaitForExit();

        }