We have discussed this question for several time . Take as look at following link:
http://www.csdn.net/expert/topic/315/315197.shtm
http://www.csdn.net/expert/topic/315/315126.shtm
http://www.csdn.net/expert/topic/315/315197.shtm
http://www.csdn.net/expert/topic/315/315126.shtm
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