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());
}
