详情见如下博客：
1 http://www.cnblogs.com/liuzhendong/archive/2012/01/29/2331189.html
2 http://blog.csdn.net/ithomer/article/details/6624684
ado和ado.net的区别如下：
1 http://sunxitao88.blog.163.com/blog/static/68314439200882272036951/
2 http://baike.baidu.com/link?url=0dQ4DILCNgXg8wRhKhVN_Qt6OJyMSmcDQELjDJ5EzzosZQ8bwZgu757ZqTOjtFmT