private void ConvexButton_Click(object sender, RoutedEventArgs e) { ConvexButton.IsEnabled = false; outputGraphicsLayer.Graphics.Clear(); GeometryService geometryService = new GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer"); geometryService.ConvexHullCompleted += GeometryService_ConvexHullCompleted; geometryService.Failed += GeometryService_Failed; geometryService.ConvexHullAsync(inputGraphicsLayer.ToList()); }