private void MyDrawObject_DrawComplete(object sender, DrawEventArgs args)
{
MyDrawObject.IsEnabled = false;
ESRI.ArcGIS.Client.Geometry.Polyline polyline = args.Geometry as ESRI.ArcGIS.Client.Geometry.Polyline;
polyline.SpatialReference = MyMap.SpatialReference;
GeometryService geometryService =
new GeometryService("http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
geometryService.CutCompleted += GeometryService_CutCompleted;
geometryService.Failed += GeometryService_Failed;
geometryService.CutAsync(parcelGraphicsLayer.Graphics.ToList(), polyline);
}