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You know the feature for example, you opened C:\test.txt if you also have the same file in another editor, and you edit it there, when you return, the app will prompt that the file has changed, whether you want to update it. How do I check if the file has been updated?
UPDATE
Asked a sister question “Using FileSystemWatcher to watch for changes to files“
You could use a FileSystemWatcher to get notifications from the file system.