Question

I would like to know if it is possible to find out when a file is added to a folder in C#. I know you can see the time of creation and many other things in the FileInfo, but nok when it was added.

Answer 1

You can use the System.IO.FileSystemWatcher. It provides methods to do exactly what you want to do:

FileSystemWatcher watcher = new FileSystemWatcher()
{
    Path = stringWithYourPath,
    Filter = "*.txt"
};
// Add event handlers for all events you want to handle
watcher.Created += new FileSystemEventHandler(OnChanged);
// Activate the watcher
watcher.EnableRaisingEvents = true

Where OnChanged is an event handler:

private static void OnChanged(object source, FileSystemEventArgs e)
{
    Console.WriteLine($"File: {e.FullPath} {e.ChangeType}");
}