private void Async1_OnClick(object sender, RoutedEventArgs e) { _ctx.Load(_ctx.GetRangeByIdTaskQuery(1), (res) => { if (res.HasError) { res.MarkErrorAsHandled(); async1Res.Text = res.Error.ToString(); } else async1Res.Text = string.Format("Returned a {0}", res.Entities.FirstOrDefault()); }, null); }