public IEnumerable <ValidationResult> Validate(ValidationContext validationContext)
{
if (Seats == null || !Seats.Any(x => x.Quantity > 0))
{
return(new[] { new ValidationResult("One or more items are required.", new[] { "Seats" }) });
}
if (Seats.Any(x => x.Quantity < 0))
{
return(new[] { new ValidationResult("Invalid registration.", new[] { "Seats" }) });
}
return(Enumerable.Empty <ValidationResult>());
}
