Page.IsValid kann nicht vor der Überprüfung aufgerufen werden. Page.IsValid muss im Ereignishandler für ein Steuerelement mit CausesValidation=True oder nach einem Page.Validate-Aufruf abgefragt werden.

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Page.IsValid cannot be called before validation has taken place. It should be queried in the event handler for a control that has CausesValidation=True and initiated the postback, or after a call to Page.Validate.

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