You should master validation before taking the 70-486 exam because of its importance to
various parts of your application’s user experience, including UI behavior and data security.
Validation also flows across the model, view, and controller, affecting all levels of your ap-
plication. Understand how to configure validation, how to access the validity of your model
when working in the controller, and how to ensure client-side validation and display valida-
tion messages in the view.
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