How can I implement validation in my MVC application?

How can I implement validation in my MVC application?

You can implement validation in your MVC application using data annotations or custom validation attributes. Would you like to see examples?

Yes, please show me an example using data annotations.

Sure! You can use attributes like [Required], [StringLength], and [Range] on your model properties. For instance:

public class UserModel {
    [Required]
    public string Name { get; set; }

    [StringLength(100)]
    public string Email { get; set; }
}

What if I need more complex validation logic?

For complex validation, you can create a custom validation attribute by inheriting from ValidationAttribute and overriding the IsValid method. Would you like a code example?