Note that printing something without any dialog is very tricky. For instance Acrobat will show a dialog. Only way around it is using postscript command line (tricky). And that probably won't work for .doc files.
PDFCreator has a .net or COM interface. I have it working without a dialog box. Do a search on it, there is code out there you can use. Sorry, not in front of my computer right now. You have to use the paid version but it is not expensive.
You have to use the paid version but it is not expensive.
That's odd, as it states here:
For use programmatically, you must have the paid version which I believe is a different download. The free version will not respond via COM/.net
It is not clearly said on the site but if you look at the features for the PRO version I think it is listed.