reading data from pdf

hi
i have read a lot about reading data from pdf but still very confused.
i have to gather data from a invoice which is in a pdf format and store it in the database now the invoice contains text, tables, signature and barcode.
this i have to again print after adding some of my data in another format and hence i need to get the data from the pdf file.
i know what i am asking for is very odd but thats what i have to do

can someone pls. guide me as to what i should do and how pls.
thankx in advance.

Have a look at iTextSharp library and see what it can or cannot do. It's a free .Net library ported from iText to C# and in my opinion, it's a very good library for creating and manipulating pdf files... It does have its weaknesses though, and there are many things that it simply cannot do. There are also many other libraries and SKD's, some are free but most will cost you big $$$... Pdf manipulation is not an easy task, and regardless of what software package you use to manipulate a pdf file, you will need to be very familiar with the Adobe Pdf Reference. That is, you need to know the file format, and how it works.