private bool IsSerialMatch(X509Certificate2 certificate, Cert certInfo) { var issuerSerial = certInfo.IssuerSerial.X509SerialNumber; string certInfoSerialNumberHex; try { certInfoSerialNumberHex = ConvertHelper.BigIntegerToHex(issuerSerial); } catch (FormatException) { certInfoSerialNumberHex = issuerSerial; } return(certificate.SerialNumber == certInfoSerialNumberHex); }