private int FindAlbumByPath(string albumPathToFind)
{
    //string albumPathToFind = @"C:\Inetpub\wwwroot\galleryserverpro\mediaobjects\Summer 2005\sunsets\desert sunsets";

    IAlbum rootAlbum = Factory.LoadRootAlbumInstance();

    return FindAlbumByPath(albumPathToFind, rootAlbum);
}

private static int FindAlbumByPath(string albumPathToFind, IAlbum albumToSearch)
{
    if (albumToSearch.FullPhysicalPath.Equals(albumPathToFind, StringComparison.OrdinalIgnoreCase))
    {
        return albumToSearch.Id;
    }
    else
    {
        foreach (IGalleryObject childAlbum in albumToSearch.GetChildGalleryObjects(GalleryObjectType.Album))
        {
            return FindAlbumByPath(albumPathToFind, (IAlbum)childAlbum);
        }
    }

    return int.MinValue;
}