How to edit existing pdf file in C#

See more:

C#

Hi I have a form in my project(like apply form) and a user must fill around 10 textboxes like (user name, address, id and....)
then after user click on a button, a new page must pop up
that page is my existing pdf file in project directory and user data must be placed in that pdf file the way I want.
the existing pdf file must be something like this:
user name: textbox1.text
Address: textbox2.text
ID: textbox3.text
how can I transfer user data to a existing pdf file and preview and print it?
do I need Itextsharp or something like that?
I couldnt find anything related to what I want around the web

What I have tried:

I couldnt find anything related to what I want around the web