1) Add a reference in your Visual Studio project to docuPrinter library. To do this: On the Project menu, click Add Reference; On the COM tab, locate docuPrinter Library and then click Select; Click OK in the Add References dialog box to accept your selections. 2) Add a reference in your project to Microsoft PowerPoint. To do this: On the Project menu, click Add Reference. On the COM tab, locate Microsoft PowerPoint and then click Select. Click OK in the Add References dialog box to accept your selections.

private void button1_Click(object sender, EventArgs e)
{

   string fileToConvert = @"c:\test.ppt";

   docuPrinter.SDK DPSDK = new docuPrinter.SDK();

   DPSDK.DocumentOutputFormat = "PDF";
   DPSDK.DocumentOutputName = "demoPPT";
   DPSDK.DocumentOutputFolder = @"c:\ ";

   DPSDK.PDFAutoRotatePage = "PageByPage";

   DPSDK.HideSaveAsWindow = true;
   DPSDK.DefaultAction = 1;
   DPSDK.ApplySettings();

   // This works only with MS Office 2003
   Microsoft.Office.Interop.PowerPoint.Application MSPowerPoint =
    new Microsoft.Office.Interop.PowerPoint.Application();
   Microsoft.Office.Interop.PowerPoint.Presentation PPTDoc;
   PPTDoc = MSPowerPoint.Presentations.Open(fileToConvert,
     Microsoft.Office.Core.MsoTriState.msoFalse, 0, 0);

   // This works only with MS Office 2000 and XP
   // PowerPoint._Application MSPowerPoint = new PowerPoint.Application();
   // PowerPoint._Presentation PPTDoc;
   // PPTDoc = MSPowerPoint.Presentations.Open(fileToConvert,0, 0, 
   //  Microsoft.Office.Core.MsoTriState.msoFalse);

   PPTDoc.PrintOptions.PrintInBackground = 0;
   PPTDoc.PrintOptions.ActivePrinter = "docuPrinter";
   PPTDoc.PrintOut(0, 9999, "", 1, 0);
   PPTDoc.Close();
   MSPowerPoint.Quit();
   MSPowerPoint = null;
                     
   int RVal = DPSDK.Create(100);

   DPSDK = null;

   if (RVal != 0) {
      MessageBox.Show("Error while creating document!!!");
   } else {
      MessageBox.Show("Done converting !!!");
   }

}