ASP MVC: Custom Validation Attribute

Question

I\'m trying to write my own Custom Validation attribute but I\'m having some problems.

The attribute I\'m trying to write is that when a user logs in, the password w

Answer 1

I don't know why this is made out to be such a big deal, just do this:

[AttributeUsage(AttributeTargets.Property, AllowMultiple = true, Inherited = false)]
public class ComparePassword: ValidationAttribute
{
    public ComparePassword() 
        : base("Passwords must match.") { }

    protected override ValidationResult IsValid (object value, ValidationContext validationContext)
    {
        if (value == null) return new ValidationResult("A password is required.");

        // Make sure you change YourRegistrationModel to whatever  the actual name is
        if ((validationContext.ObjectType.Name != "YourRegistrationModel") 
             return new ValidationResult("This attribute is being used incorrectly.");
        if (((YourRegistrationModel)validationContext.ObjectInstance).ConfirmPassword != value.ToString())
            return new ValidationResult("Passwords must match.");

        return ValidationResult.Success;
    }
}

Now all you need to do is add [ComparePassword] to your password property, nothing to pass... simple and fairly clean