/// <summary>
        /// Updates the data store records with the values of this instance.
        /// </summary>
        private void SaveExisting()
        {
            if (MimeTypeId == int.MinValue)
            {
                throw new InvalidOperationException("Cannot call SaveExisting for new MIME types.");
            }

            using (var repo = new MimeTypeRepository())
            {
                var mtDto = repo.Find(MimeTypeId);
                if (mtDto != null && mtDto.MimeTypeValue != FullType)
                {
                    mtDto.MimeTypeValue = FullType;
                    repo.Save();
                }
            }

            using (var repo = new MimeTypeGalleryRepository())
            {
                var mtDto = repo.Find(MimeTypeGalleryId);
                if (mtDto != null && mtDto.IsEnabled != AllowAddToGallery)
                {
                    mtDto.IsEnabled = AllowAddToGallery;
                    repo.Save();
                }
            }
        }
        /// <summary>
        /// Permanently delete this MIME type from the data store.
        /// </summary>
        public void Delete()
        {
            if (MimeTypeId == int.MinValue)
            {
                return;
            }

            using (var repo = new MimeTypeRepository())
            {
                var mtDto = repo.Find(MimeTypeId);
                if (mtDto != null)
                {
                    repo.Delete(mtDto);
                    repo.Save();
                }
            }
        }