File is being used by another process

Question

I have a program that roughly does this:

1. open a file to read from it.
2. close the file
3. Start a filewatcher to watch for changes in the file.

Answer 1

You can use a tool like Process Explorer from http://www.sysinternals.com to see who has the open handle to the process

The file is most likely held open by whatever caused the change notification to fire in the first place.