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Lam Hoang Viet wrote:
> How to hidden text when i embeded it in pdf file (watermark) ?
> I mean that add invisible text as a watermark into pdf file using 
> itextsharp

OK, then you need to set the render mode to invisible.
Look for examples with TEXT_RENDER_MODE_INVISIBLE
http://lmgtfy.com/?q=TEXT_RENDER_MODE_INVISIBLE

> And if i embeded successfully, how to get text from embeded pdf file ?
> I mean that if i had a pdf file that was added invisible text, how to 
> extract invisible text from that pdf file.

You're repeating the question.
Manually: I think you can select the text by clicking and dragging your 
mouse pointer over the location of the text.
Programmatically: you'll have to parse the content stream; that's not 
easy, but not impossible either.
Just make sure you look for the render mode operator and find out where 
it's set to invisible.

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