How to search a word or number in multiple PDF documents. In one go!

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C#

.NET

itextsharp

VS2013

Hello All,

Firstly, am new to this coding and learning step by step.

I have been searching for a logic to "Search a word in multiple PDF Documents", but in vain. Can anyone please share the thoughts or logic to obtain said process, it will be greatly helpful.

Let me elaborate my operation with an example.
Well, i have multiple PDF files and i need to check a particular word/number within it, if the word appears in the PDF's then it should return True if not throw an error as False with the statement of error containing file.

Example:

1. ABS.pdf has "123" (Contains the number)
2. CCC.pdf has "123" (Contains the number)
3. XYZ.pdf has "145" (Doesn't contain the number)

Well, if the above files is searched using the keyword "123" then the application should return "XYZ.pdf" Doesn't contain "123" number.

Note: This operation should be done on bulk/multiple PDF's in one go.

What I have tried:

I stumbled upon the DLL called iTextSharp but lacking the logic, how to segregate the code.

Any help will be greatly appreciated.

Thanks
Saikrishna