public IEnumerable <ValidationResult> Validate(ValidationContext validationContext)
{
var errors = new List <ValidationResult>();
if (TechnicalAssistanceRequestSimples != null)
{
var reportedYears = TechnicalAssistanceRequestSimples.Select(x => x.FiscalYear).Distinct().OrderByDescending(x => x).ToList();
var reportedYearsMissingData = reportedYears?.Select(x => x).Where(x => TechnicalAssistanceRequestSimples.Any(y => y.FiscalYear == x && y.TechnicalAssistanceTypeID == null)).ToList();
reportedYearsMissingData?.ForEach(x => errors.Add(new ValidationResult($"{x} has rows missing a value for Assistance Type.")));
}
return(errors);
}