public async Task WaitSync()
    {
        var watch = System.Diagnostics.Stopwatch.StartNew();

        Session session = App.AppEnvironmentService.SyncDB.RealmInstance.GetSession();
        if (session != null && Connectivity.NetworkAccess == NetworkAccess.Internet)
        {
           session.Start();
            try
            {
                await Task.WhenAll(session.WaitForDownloadAsync(),
                                    session.WaitForUploadAsync());
               session.Stop();
            }
            catch (Exception ex)
            {
                var t = ex;
            }
            App.AppEnvironmentService.SyncDB.GetCurrentUserExtension();
        }
          watch.Stop();
          var elapsedMs = watch.ElapsedMilliseconds;
    }