C#: Using FileSystemWatcher to watch for changes to files

Question

Ok, so I learnt from How to check if a open file has been updated that I should use a FileSystemWatcher to watch for changes to files. Then now, the question is if I must keep

Answer 1

This really is a trade-off. Many watchers will consume more resources, but if you have a watcher on a directory containing many files/sub directories (e.g. C:), this will also consume a lot of resources.

If all the files are located in a single folder, you should just use the single watcher.