How to automate Adobe Acrobat Pro from .NET application?

Question

I am creating a PDF document from a .NET application (written in C#) that serves as a "table of contents" to some other documents (using hyperlinks). In order for the user to be able to search in all documents at once, we're creating a search index/catalog of all the linked documents (which all happen to be in the same directory). To make things even easier, we also add a form button to the TOC that brings up the "Advanced Search" dialog. Nothing too complicated, in other words.

How can I automate this process? From googling, it seems that I can either create a folder script (in JavaScript) or directly interact with Acrobat using COM...? Unfortunately, I have found very little documentation.

Edit: It seems like the Adobe PDF Library is exactly what I want, but it also seems ridiculously expensive. But maybe the Acrobat SDK would be an OK solution? We already have Acrobat Pro licenses, requiring Acrobat to be installed wouldn't be a problem.

Could anyone please point me in the right direction?

Clarify what you are trying to achieve. It seems like you want to be able to search through pdfs as if they were text, or are there more UI-ish specifics you're after? — Davesoft
@Davesoft The clarification can be found here: stackoverflow.com/questions/51127552/… — TravelingFox
"associate the .pdx file with my .pdf document, so it gets loaded automatically?" Ah, so this was never a .net question afterall. Thought so. Good luck fighting adobe software :) — Davesoft