On
each page, you can use Stamper.StampText() to add your label. You can
iterate over each page (so that you can apply the specific page number
to each page) as shown at:
FYI,
PDFNet also provides a page labeling API, which customizes the names of
each page as you scroll through the document in a PDF viewer (but
doesn't add a stamp onto the page itself). For sample code, see:
There
are many other options if these don't work for you. You might find it
helpful to check out similar questions in the FAQ or search the PDFNet
Forum: