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        private void button1_Click(object sender, RoutedEventArgs e)
        {
            System.IO.FileSystemWatcher fsw = new System.IO.FileSystemWatcher("C:\\");
            fsw.Filter = "protocol.txt";    // "" für alles oder wildcards
            fsw.Changed += new System.IO.FileSystemEventHandler(fsw_Changed);
            fsw.EnableRaisingEvents = true;
        }

        void fsw_Changed(object sender, System.IO.FileSystemEventArgs e)
        {
            Console.WriteLine(e.Name + e.FullPath + e.ChangeType);
        }