If you care about THREAD SAFE, please refer to this article.
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Http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnforms/html/winforms07202004.asp
http://msdn.microsoft.com/library/en-us/dnforms/html/winforms08162002.asp
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http://msdn.microsoft.com/library/en-us/dnforms/html/winforms01232003.asp
