Cannot print without PrintDialog

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C#

printing

I'm trying to create automatically PDF documents from WORD documents, using a PDF creator as a default printer. However, I don't want to use the PrintDialog everytime, I need to make it automatic by the source code ( I have thousands of WORD documents). The problem is that it seems I cannot inherit all the settings, coming with the PrintDialog and I can
create a PDF file but it's 0kb. It raises all the PrintDocument events
(BeginPrint,QueryPageSettings,PrintPage,EndPrint), but finally the PDF document is 0kb.

Does anyone met this issue?

Here is a sample with static fields:

private void DocToPdf()
 {
     PrintDocument pdDoc = new PrintDocument();
     try
     {
         pdDoc.DocumentName = @"C:\Input.doc";
         pdDoc.PrinterSettings.PrintToFile = true;
         pdDoc.PrinterSettings.PrintFileName = @"C:\Output.pdf";
         pdDoc.PrinterSettings.PrinterName = "My_printer";
         pdDoc.DefaultPageSettings = new PageSettings(new PrinterSettings());

         pdDoc.PrintPage += new PrintPageEventHandler(pdDoc_PrintPage);
         pdDoc.BeginPrint += new PrintEventHandler(pdDoc_BeginPrint);
         pdDoc.QueryPageSettings += new QueryPageSettingsEventHandler(pdDoc_QueryPageSettings);
         pdDoc.EndPrint += new PrintEventHandler(pdDoc_EndPrint);

         if (pdDoc.PrinterSettings.IsValid)
             pdDoc.Print();
     }
     catch (Exception ex)
     {
         string msg = ex.Message;
     }
 }