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http://msdn.microsoft.com/zh-cn/library/512aeb7t(v=VS.80).aspx
http://www.cnblogs.com/Charles2008/archive/2008/06/11/1217294.html
http://developer.51cto.com/art/200906/131236.htm
http://blog.csdn.net/kagar/archive/2006/12/28/1465426.aspx
