Read/Process/Scan a PDF: .NET Core/C#

What's the best way to take text in a pdf document and add it to a database? Like if I wanted to pull the dollar amount from an invoice, and every invoice is formatted exactly the same way, and add that dollar amount to an existing database. Would I use an OCR library like tesseract or something similar? Is there a library that exists that does this?

I'm using .NET Core and C# but if you are using or have experience in something else I would still be interested.