public void Save()
        {
            MovieXmlDataService movieXmlDataService = new MovieXmlDataService();

            using (movieXmlDataService)
            {
                movieXmlDataService.Write(_movies);
            }
        }
        public MovieRepository()
        {
            MovieXmlDataService movieXmlDataService = new MovieXmlDataService();

            using (movieXmlDataService)
            {
                _movies = movieXmlDataService.Read() as List <Movie>;
            }
        }