/// <summary>
 /// Saves the <see cref="DocumentBookmark"/> object.
 /// </summary>
 /// <param name="bookmark">The bookmark object.</param>
 public override void Save(DocumentBookmark bookmark)
 {
     if (!_AllBookmarks.Contains(bookmark))
     {
         bookmark.Id = _AllBookmarks.Count + 1;
         _AllBookmarks.Add(bookmark);
     }
 }
 public virtual void Save(DocumentBookmark bookmark)
 {
     // Noting
 }