script.cs

VerificationResult result;

//...

if (result.Status == CheckStatus.Success) {
    Console.WriteLine("Success");
} else {
    Console.WriteLine("Errors:");

    IEnumerable<ConstraintResult> constraints = result
            .CheckResults
            .SelectMany(pair => pair.Value.ConstraintResults)
            .Where(c=> c.Status == ConstraintStatus.Failure);

    constraints
        .Select(constraintResult => constraintResult
            .Message.GetOrElse(string.Empty))
        .ToList().ForEach(Console.WriteLine);
}