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http://www.accdb.net/article.asp?id=608

http://hi.baidu.com/yeihizhi1/blog/item/455c07d42fcf2ace50da4b31.html 

 http://www.csharpwin.com/csharpspace/8382r3615.shtml

http://developer.51cto.com/art/200909/149097.htm 

http://www.cnntec.com/archiver/showtopic-2973.html 

http://iofeng.com/Ublog/ShowBlog.aspx?id=29 

http://htmlagilitypack.codeplex.com/