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Additionally, there's a numeric range restriction in place for the for validation purposes. There may be instances where you need more features than built-in attributes provide.Many useful validation attributes can be found in the System. For those times, you can create custom validation attributes by deriving from .
When you use a Nullable can be used to control the client-side validation error message.Validation is necessary although it can be redundant and tedious to implement.In MVC, validation happens on both the client and server. NET has abstracted validation into validation attributes.The Bind Required attribute (also see Customize model binding behavior with attributes) is useful to ensure form data is complete.When applied to a property, the model binding system requires a value for that property.
These attributes contain validation code, thereby reducing the amount of code you must write. Validation attributes are a way to configure model validation so it's similar conceptually to validation on fields in database tables.