Page.IsValid ne peut pas être appelé avant la validation. Il doit être lu dans le gestionnaire d'événements pour un contrôle avec CausesValidation=True ou après un appel à Page.Validate.

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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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