[VB.Net] Add watermark to existing Pdf file using iTextSharp

[stanav]

This is excellent code and this is what i needed. BTW, I have question if this is possible, can the watermark appear behind page?

Thanks

Yes, in the code I posted, the water mark is written to the over content of the page... This will ensure that the water mark will always be visible (even when the page contains an image, for example). If your page contains mostly text, it is recommended to put the water mark on the under content of the page instead. All you have to do is changing this line:

underContent = stamper.GetOverContent(i)

To this

underContent = stamper.GetUnderContent(i)

The rest of the code remains unchanged.