public override IEnumerable <ErrorInfo> PerformComplexValidation()
{
List <ErrorInfo> errorList = new List <ErrorInfo>();
if (DateOfBirth.Year == null ||
DateOfBirth.Month == null ||
DateOfBirth.Day == null ||
!DateOfBirth.ToDateTime().Between(DateUtil.CurrentDateTime.AddYears(-99), DateUtil.CurrentDateTime.AddYears(-18)))
{
errorList.Add(new ErrorInfo("DateOfBirth", "Please enter a valid date of birth, You must be over the age of 18"));
}
return(errorList);
}