private FileSystemWatcher _fsw;

init()
_fsw.Path = path;
_fsw.Filter = "*.*";  // only filename, no path
_fsw.EnableRaisingEvents = true;


            _fsw = new System.IO.FileSystemWatcher();
            _fsw.Changed += new System.IO.FileSystemEventHandler(this.FSW_Changed);
            _fsw.Created += new System.IO.FileSystemEventHandler(this.FSW_Created);
            _fsw.Deleted += new System.IO.FileSystemEventHandler(this.FSW_Deleted);
            _fsw.Renamed += new System.IO.RenamedEventHandler(this.FSW_Renamed);
}


        void FSW_Renamed(object sender, RenamedEventArgs e) {
            filewatch();
        }
        void FSW_Deleted(object sender, FileSystemEventArgs e) {
            filewatch();
        }
        void FSW_Created(object sender, FileSystemEventArgs e) {
            filewatch();
        }
        void FSW_Changed(object sender, FileSystemEventArgs e) {
            filewatch();
        }

        delegate void showFilesInListViewCallback(string actualPath);

        private void filewatch() {
            Application.Current.Dispatcher.Invoke(new Action(() => { showFilesInListView(_actualPath); }));
        }



	private void showFilesInListView(String path) {
		// Aktion
	}