Printing multiple DOCX files from C# into one pdf


I've tried the example (C# VS 2005) added with PDFCreator (Sample 1) and it seems to do a good job in printing DOCX to PDF. However what I wanted to do is print multiple documents into one PDF. Anyone can show me how I can achieve this (simple example, or what to add to Sample 1 to achieve this would be nice).

With regards,