单项选择题
YoucreateanASP.NETpagenamedTestPage.aspxthatcontainsvalidationcontrols.YouneedtoverifythatallinputvaluessubmittedbytheuserhavebeenvalidatedbytestingthePage.IsValidproperty.Whichpageeventshouldaddaneventhandlerto？（）
A.Ini
B.Load
C.PreInit
D.PreLoad
A.NETpagenamedTestPage.aspxthatcontainsvalidationcontrols.YouneedtoverifythatallinputvaluessubmittedbytheuserhavebeenvalidatedbytestingthePage.IsValidproperty.Whichpageeventshouldaddaneventhandlerto？（）
A.Ini
B.Load
C.PreInit
D.PreLoad
