What are the best practices for validation in ASP.NET MVC?

What are the best practices for validation in ASP.NET MVC?

In ASP.NET MVC, best practices for validation include using data annotations, implementing custom validation attributes, and leveraging the ModelState to check for errors.

Can you explain how to use data annotations for validation?

Sure! Data annotations are attributes you can apply to model properties to enforce validation rules, like [Required], [StringLength], and [Range]. They help ensure that user input meets specific criteria.

What if I need more complex validation logic?

For complex validation, you can create custom validation attributes by inheriting from ValidationAttribute and overriding the IsValid method to implement your logic.

How can I display validation messages in the view?

You can display validation messages in your view using the Html.ValidationMessageFor helper method, which shows error messages associated with a specific model property.