None at all of the examples I am finding actually work once I implement and modify the code for my particular situation. It only seems to loop through the root folder and does not look through files in the sub folders.
It seems trivial. Presumably you looked into the syntax of Directory.GetFiles() (see link
Using a searchOption of 'AllDirectories' would seem to be the answer, but I'm guessing that you've tried that already? What problems did you have?
Help us to help you. For better, quicker and more-focused answers to your questions, consider following the advice in this
If the answer to your question can be found with a brief Google search, please perform the search yourself, rather than expecting one of the SSC members to do it for you.
Please surround any code or links you post with the appropriate IFCode formatting tags. It helps readability a lot.