MVC Form Validation on Multiple Fields

Question

How would I go about having multiple textboxes on an MVC 3 form treated as one for the purposes of validation?

It\'s a simple phone number field with one textbox for

Answer 1

You could handle this by putting IValidatableObject on the model class, and implementing the Validate method.

It could look something like this:

public IEnumerable Validate(ValidationContext validationContext)
{
      if (String.IsNullOrEmpty(_PhonePart1) || String.IsNullOrEmpty(_PhonePart2)
            || String.IsNullOrEmpty(_PhonePart3))
      {
           yield return new ValidationResult("You must enter all " + 
                  "three parts of the number.");
      }

}