private async Task UpdateFileAsync()
 {
     string jsonPhotoLibrary = JsonConvert.SerializeObject(this.libraryCollection);
     await FileHelper.WriteTextFileAsync(LIBRARY_MANAGER_FILE_NAME, jsonPhotoLibrary);
 }
 private PhotoLibraryManager()
 {
     this.libraryCollection       = new Dictionary <string, string>();
     this.PhotoLibraryManagerFile = FileHelper.GetFilePath(LIBRARY_MANAGER_FILE_NAME).Result.Path;
 }