Fill existing PDF fields from Database using iTextSharp in ASP.Net

Hello,

I have the issues to fill up W4 IRS PDF form with a database (using iTextSharp in ASP.Net).

I like to solve this way: Copy W4 form and create an W4.jpg image file.  Place this image on a webpage three img src HTML.  drag and drop textbox objects on each field needs to fill up with a data in table sql server after connected.  I don't know how to place textbox object at each field (needs to display data) position on image.

Please help.  Thank you so much