public async Task GetTrainingSessions()
        {
            if (Connectivity.NetworkAccess == NetworkAccess.None)
            {
                return;
            }

            var syncRequestUrl = $"{Constants.WebServerBaseUrl}{syncRequestBase}";

            try
            {
                // create the sync request
                var userId = Preferences.Get(Constants.UserIdPreference, "Matt");

                var syncRequest = new SyncRequest {
                    FromVersion = 0, UserId = userId
                };

                // perform the request
                var request = new HttpRequestMessage(HttpMethod.Post, syncRequestUrl);

                request.Content = new StringContent(JsonConvert.SerializeObject(syncRequest), Encoding.UTF8, "application/json");

                var response = await client.SendAsync(request);

                // pull out the info
                var syncResultJson = await response.Content.ReadAsStringAsync();

                var syncResult = JsonConvert.DeserializeObject <DataSyncResult>(syncResultJson);

                // save training sessions locally
                var localData = DependencyService.Get <ILocalDataService>(DependencyFetchTarget.GlobalInstance);

                localData.SaveSessionFromWeb(syncResult.TrainingData);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex);
            }
        }
        public async Task GetTrainingSessions()
        {
            if (Connectivity.NetworkAccess == NetworkAccess.None)
            {
                await Shell.Current.DisplayAlert("No Internet", "You do not have a connection to the internet", "OK");

                return;
            }

            var syncRequestUrl = $"{Constants.WebServerBaseUrl}{syncRequestBase}";

            try
            {
                // Get the latest version sync'd
                var syncPoint = (int)await dataService.GetLatestSyncVersion();

                // create the sync request
                var syncRequest = new SyncRequest {
                    FromVersion = syncPoint, UserId = userName
                };

                // perform the request
                var request = new HttpRequestMessage(HttpMethod.Post, syncRequestUrl);

                request.Content = new StringContent(JsonConvert.SerializeObject(syncRequest), Encoding.UTF8, "application/json");

                var response = await client.SendAsync(request);

                // pull out the info
                var syncResultJson = await response.Content.ReadAsStringAsync();

                var syncResult = JsonConvert.DeserializeObject <DataSyncResult>(syncResultJson);

                await dataService.SaveSessionsFromWeb(syncResult.Metadata.Sync, syncResult.TrainingData);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex);
            }
        }