用helpProvider,具体看看这个代码(VB.Net)Visual Basic .NET Code Sample: Associating Help with an Application
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvssamp/html/vbcs_AssociatingHelpwithanApplication.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvssamp/html/vbcs_AssociatingHelpwithanApplication.asp
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