PatientPending.Core.NHSNumber.Validate C# (CSharp) Метод

        public bool Validate()
        {
            if (_digits.Length != 10)
                return false;
            int sum = 0;
            int factor = 10;
            for (var i = 0; i < 9; i++) {
                sum += _digits[i]*factor;
                factor--;
            }
            var checkDigit = 11 - (sum%11);
            if (checkDigit == 11) checkDigit = 0;
            return checkDigit == _digits[9];
        }