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You can configure this number by inserting the following code into the and react appropriately.

In many cases, the appropriate reaction is to return an error response, ideally detailing the reason why model validation failed.

Just inherit from the attribute checks the genre first, and if it's a classic, then it checks the release date to see that it's later than 1960. The attribute accepts an integer parameter representing the year that you can use to validate data.

You can capture the value of the parameter in the attribute's constructor, as shown here: public class Classic Movie Attribute : Validation Attribute, IClient Model Validator { private int _year; public Classic Movie Attribute(int Year) protected override Validation Result Is Valid(object value, Validation Context validation Context) Client side validation is a great convenience for users.

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.

This includes constraints such as assigning data types or required fields.

Other types of validation include applying patterns to data to enforce business rules, such as a credit card, phone number, or email address.

In business terms, even a few fractions of seconds multiplied hundreds of times each day adds up to be a lot of time, expense, and frustration.Below is an annotated model from an app that stores information about movies and TV shows.Most of the properties are required and several string properties have length requirements.The j Query Unobtrusive Validation script is a custom Microsoft front-end library that builds on the popular j Query Validate plugin.Without j Query Unobtrusive Validation, you would have to code the same validation logic in two places: once in the server side validation attributes on model properties, and then again in client side scripts (the examples for j Query Validate's method shows how complex this could become).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.

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