Editing pdf in C#.net

Check this article for adding text to blank PDF page in C# , hope this helps :)

Standard .NET classes don't directly support handling PDF Document format. You need to use a programming SDK (like leadtools or itextsharp). Since I am not familiar with itextsharp, I will talk about my experience with leadtools functions. This SDK supports loading PDF files, extract text and save it  back as PDF document format.
I am suggesting the following approach using lead tools functions:
- Load the PDF file as image (all objects (Text, Images, hyperlinks, etc.) inside the PDF file will be rasterized as one image).
- Pass the rasterized image to one of leadtools OCR engines. Lead OCR engines give the ability to define a zone on the image, recognize the text, edit it and then save it back as PDF document format.
You can find more information here:
http://support.leadtools.com/CS/forums/31677/ShowPost.aspx

Hi R J/Alex,

        Thanks for your replies, but i have already referred those references, but i am not able to fill my requirement.

As RJ said, you can try itextsharp or any other 3rd party PDF component..Anyway, I recommend you donwloading and evaluating this .NET PDF API (avalible on Codeplex http://pdfapi.codeplex.com/), which enables you to open/read/edit PDF file in any .NET platform.Hope helps.

Regards

see this..

http://simpledotnetsolutions.wordpress.com/2012/04/08/itextsharp-few-c-examples/

you can use itextsharp in your example. 

Also, I have seen similar post in ASP.net forums.

http://forums.asp.net/t/1408202.aspx?read+and+edit+pdf+using+c+

This may help you. Place your code if you find any issues.