public override int GetHashCode()
        {
            int hash = 17;

            hash ^= 31 + DriverMedicalCertificateId.ToString().ToInt();
            return(hash ^= 31 + DriverCategoryId.ToString().ToInt());
        }
        public override int GetHashCode()
        {
            int hash = 17;

            hash ^= 31 + DriverLicenseId.ToString().ToInt();
            return(hash ^= 31 + DriverCategoryId.ToString().ToInt());
        }