Have a look at iTextSharp. iTextSharp is a port of the iText , a free Java-Pdf library.
To quote iText:
You can use iText to:
- Serve PDF to a browser
- Generate dynamic documents from XML files or databases
- Use PDF's many interactive features
- Add bookmarks, page numbers, watermarks, etc.
- Split, concatenate, and manipulate PDF pages
- Automate filling out of PDF forms
- Add digital signatures to a PDF file
- And much more...
