public static void DeleteWhenFoundInTree(LocalAlbum alb, ref LocalAlbumList lstAlbum)
        {
            LocalAlbum treeAlb = null;

            for (int i = 0; i < lstAlbum.Count; i += 1)
            {
                treeAlb = lstAlbum.FirstOrDefault(a => a.LocalDir == alb.LocalDir);
                if (treeAlb != default(LocalAlbum))
                {
                    DeleteAlbum(ref treeAlb);
                    lstAlbum.RemoveAt(i);
                    return;
                }
            }
            for (int i = 0; i < lstAlbum.Count; i += 1)
            {
                LocalAlbumList FoundInLstAlb = lstAlbum[i].SubAlbums;
                DeleteWhenFoundInTree(alb, ref FoundInLstAlb);
            }
        }