Delegate & Predicate Delegates
delegate
http://www.dotblogs.com.tw/atowngit/archive/2009/12/07/12311.aspx
http://blog.dabutek.com/index.php?op=ViewArticle&articleId=2316&blogId=2
http://www.dotblogs.com.tw/yc421206/archive/2009/02/16/7206.aspx
Predicate Delegates
http://www.laitry.com/trip/185.html