VS 2005 Enable Comments(iTextsharP)

You can add text annotations (commonly referred to as comments) when you create you pdf file. Once the pdf is created, it's out of scope for iTextSharp to do anything. That is, if you expect to create a pdf file that allows user to put in their own comments, then you're thinking of track. This is a feature of the application used to open the pdf file and not the file itself. The user will need to use a program that is capable of viewing/editing pdf files such as Adobe Acrobat (full version, not the reader).

Edit: FoxIt 3 is a free pdf reader program that has the capability to add annotations. You can download it here:
http://www.foxitsoftware.com/pdf/reader/reader3.php