modifying text in Editable Pdf files

Question

I am working on a project and I need to insert data into specified fields in an editabble pdf file using a C# program.

I am not very familiar with editable pdf files and programatically modifing field data using C#.
Does anyone know of any C# open-source APIs available in .net for filling Editable pdf files?

thanks
nRk

Answer 1

iTextSharp is a .NET library that among other features allows you to fill pdf forms.

Answer 2

I think editable pdf files means form data pdf. For this, you need to use Adobe FDF toolkit. See following:
http://redgoose.ca/blog/adobe-fdf-tookit-with-c-net