http://weblogs.asp.net/bradleyb/archive/2005/12/09/432802.aspx
http://www.cnblogs.com/jackielin/archive/2006/10/28/542430.html
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http://weblogs.asp.net/bradleyb/archive/2005/12/09/432802.aspx
http://www.cnblogs.com/jackielin/archive/2006/10/28/542430.html