void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)
{
FeatureSet featureSet = args.FeatureSet;
if (featureSet != null && featureSet.Features.Count > 0)
DataListBox.ItemsSource = featureSet.Features;
else
MessageBox.Show("No features returned from query");
}