RequiredIf Conditional Validation for two variables in MVC4

Question

I have a model class that is following

 public bool Saturday{ get; set; }

 public bool Sunday{ get; set; }

 public string Holiday{ get; set; }

Answer 1

If the need for more complex validation arises, I'd recommend implementing IValidatableObject.

public class YourModel : IValidatableObject
{
    public bool Saturday{ get; set; }

    public bool Sunday{ get; set; }

    public string Holiday{ get; set; }

    public IEnumerable Validate(ValidationContext validationContext)
    {
        var result = new List();

        if (Saturday == false && Sunday == false && string.IsNullOrEmpty(Holiday))
        {
            result.Add(new ValidationResult("Holiday is required outside weekends"));
        }

        return result;
    }
}

If you combine property checks with IValidatableObject, be sure to note this behaviour.