Validating user control

It saves time they would otherwise spend waiting for a round trip to the server.

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.

By Rachel Appel Before an app stores data in a database, the app must validate the data.

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

When an element is invalid, two things occur: If you want to take control over the look and feel of native error message, or if you want to deal with browsers that do not support HTML5 forms validation, there is no way but to use Java Script.

More and more browsers now support the constraint validation API, and it's becoming reliable.

Just inherit from the attribute checks the genre first, and if it is a classic, then it checks the release date to see that it is 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.

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However, this doesn't disable support for the constraint validation API nor the application of the CSS pseudo-class or As you can see, the HTML is almost the same; we just removed the HTML5 parts.

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