单项选择题
How to show help file by press F1？（）
A.SetShowHelp
B.SetHelpString
C.SetHelpKeyword
D.SetHelpNavigator
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单项选择题
YouarecreatingaWindowsFormsapplicationbyusingthe.NetFramework3.5.Youplantodisplaydetailedhelpinstructionsforeachcontrolintheform.Youcreateahelpfile.YouconfigureaHelpProvidercomponentontheform.YouneedtodisplaythehelpfileforthecontrolthatisfocusedwhentheF1keyispressed.WhichmethodoftheHelpProviderclassshouldyoucallforeachcontrol？（）
A.SetShowHelp
B.SetHelpString
C.SetHelpKeyword
D.SetHelpNavigator
