Q:
What is the best option to add additional text in the header and
footer?
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A:
To add new content to an existing page please follow the steps
described in the following FAQ: http://pdftron.com/net/faq.html#how_watermark
Also, ElementBuilder sample project is also a good place to take a
look bacause from the PDFNet API point of view there is no difference
between creating new PDF pages and adding new content to existing PDF
pages.