Microsoft Personal Web Site Starter Kit – Random Image Web User Control

public class Photo {

	private int _id;
	private int _albumid;
	private string _caption;

	public int PhotoID { get { return _id; } }
	public int AlbumID { get { return _albumid; } }
	public string Caption { get { return _caption; } }

	public Photo(int id, int albumid, string caption) {
		_id = id;
		_albumid = albumid;
		_caption = caption;
	}

}

public class PhotoExt : Photo
{

    private int _page;

    public int Page { get { return _page; } }

    public PhotoExt(int id, int albumid, string caption, int page)
        : base(id, albumid, caption)
    {
        _page = page;
    }
}