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Nick Harrison explains how to do it, and also points out why it is so important to provide input validation In IT development work, security is everyone’s responsibility.
Most computer security breaches do not usually occur as a result of a single vulnerability.
Data annotations are attribute classes that live in the System. Data Annotations namespace that you can use to apply to (decorate) classes or properties to enforce pre-defined validation rules. The bottom line is that you can use data annotations anywhere.
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NET MVC provides a way of providing declarative validation of user inputs.
It removes a lot of the tedium of this important task.
One of the features of HTML5 is the ability to validate most user data without relying on scripts.
This is done using validation attributes on form elements, which allow you to specify rules for a form input like whether a value needs to be filled in, the minimum and maximum length of the data, whether it needs to be a number, an email address, etc., and a pattern that it must match.
Between the built-in validators and your own custom validation code, you’re all set with maintainable and clean validation.