public async Task LeaderGroupChart() { try { filter.IsVisible = false; LeaderGroupFrame.IsVisible = true; LeaderGroupGraph.IsVisible = true; var getCandidature = await CommonLib.AllLeaders(CommonLib.ws_MainUrlMain + "LeaderApi/GetAllLeader"); if (getCandidature.chartData != null) { foreach (var item in getCandidature.chartData) { LeaderId = item.LeaderCode; break; } pickerLeader.ItemsSource = getCandidature.chartData; pickerLeader.SelectedIndex = 0; } } catch (Exception ex) { await App.Current.MainPage.DisplayAlert("", ex.Message, "OK"); } }