private string ValidateLicense(License license)
{
//// validate license and define return value.
const string ReturnValue = "License is Valid";
var validationFailures =
license.Validate()
.ExpirationDate()
.When(LicenseException)
.And()
.Signature(publickey.Text)
.AssertValidLicense();
var failures = validationFailures as IValidationFailure[] ?? validationFailures.ToArray();
return(!failures.Any() ? ReturnValue : failures.Aggregate(string.Empty, (current, validationFailure) => current + validationFailure.HowToResolve + ": " + "\r\n" + validationFailure.Message + "\r\n"));
}
