In this chapter you looked at data annotations for validation, and saw how the MVC run time uses model metadata, model binders, and HTML helpers to construct pain-free validation support in a web application. The validation supports both server-side validation and client-validation features with no code duplication. You also built a custom annotation for custom validation logic, and compared the annotation to validation with a self-validating model. Finally, you looked at using data annotations to influence the output of the HTML helpers rendering HTML in your views.

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