1、微软文章:《设计数据层组件并在层间传递数据 》
http://www.microsoft.com/china/MSDN/library/archives/library/dnbda/html/boagag.asp#boagag_implementingbusinessentities
2、Object/DataSet Relational Mapping
http://blog.youkuaiyun.com/xuan_oscar/archive/2007/01/07/1476288.aspx
3、ORM学习笔记(一)续
http://blog.youkuaiyun.com/xuan_oscar/archive/2007/01/08/1477509.aspx
5、NHibernate学习
http://sifang2004.cnblogs.com/archive/2005/09/05/230713.html