public override NSString GetFormattedDataMarkerLabel(SFChart chart, NSString label, nint index, SFSeries series)
 {
     try
     {
         int   seriesIndex = (int)chart.IndexOfSeries(series);
         IList data        = Chart.Series[seriesIndex].ItemsSource as IList;
         //string formattedLabel = label.ToString() + " (" + (data[(int)index] as ChartModel).Name + ")";
         return(new NSString(label.ToString()));
     }catch (Exception ex)
     {
         MessagingCenter.Send((App)Xamarin.Forms.Application.Current, AppConstant.ErrorEvent, ex.ToString());
     }
     return(new NSString(""));
 }