How do I add a watermark to a page?

Q: I am looking in the features section of your web site and cannot
find any reference to a watermark. One of my requirements is to open
an existing pdf file, write watermark text, save and close the image
besides adding a page to the file.

A: Yes, you can watermark/stamp existing PDF documents with new text
and images.
As a starting point you may want to take a look at the following FAQ
  How do I add a watermark to a page?:

Q: Is there anything I need to do besides including a reference to the
.dll? I cannot get the how_watermark example to work.

A: Yes, you need to add a reference to PDFNet DLL.
Also you will need to initialize PDFNet (using PDFNet.Initialize() and
PDFNet.SetResourcePath(... pdfnet.res") - see and

For experimentation purposes, you may want to copy and rename one of
the sample projects (under PDFNet/Samples) and then use this project as
a starting point.