This article shows how to watermark PDFs using the open source PDF generation library iTextSharp, C#, and ASP.NET.
Often enough, Web Applications use PDF documents which may be printable versions of pages, custom forms, manuals etc. When the document consists of critical or sensitive information, the pages are watermarked with the company logo or some other custom image file. There are some off-the-shelf commercial products which have this feature. This article looks at such an implementation using the open source PDF generation library iTextSharp, C#, and ASP.NET.
For detail, please visit http://dotnetslackers.com/articles/aspnet/WatermarkingPDFDocumentsUsingHttpHandlers.aspx