public async Task <string> QueryBloodType()
        {
            NSError error;
            string  resultString = string.Empty;
            await Task.Factory.StartNew(() => resultString = m_healthKitStore.GetBloodType (out error).BloodType.ToString());

            HealthKitDataContext.ActiveHealthKitData.BloodType = ParseBloodTypeString(resultString);
            Console.WriteLine(ParseBloodTypeString(resultString));
            return(ParseBloodTypeString(resultString));
        }