void trackOverlay_TrackEnded (object sender, TrackEndedTrackInteractiveOverlayEventArgs e)
        {
            InMemoryFeatureLayer memLayer = new InMemoryFeatureLayer();
            if (wpfMap1.TrackOverlay.TrackMode == TrackMode.Polygon)
            {
               PolygonShape polygonShape = (PolygonShape)e.TrackShape;
                memLayer.InternalFeatures.Add(new Feature(polygonShape));
                MessageBox.Show("The polygone is saved in memory!");
            }
            else
            MessageBox.Show("The line zone is not saved!");

            LayerOverlay inmemoryOverlay = new LayerOverlay();
            inmemoryOverlay.Layers.Add("PolyLayer", memLayer);
            wpfMap1.Overlays.Add("PolyLayer", inmemoryOverlay);
            

        }

 private void btnSaveZones_Click(object sender, RoutedEventArgs e)

polygfts = polygLayer.FeatureSource.GetAllFeatures(ReturningColumnsType.AllColumns);


if (wpfMap1.TrackOverlay.TrackMode == TrackMode.Polygon) 

FeatureLayer polyArea = wpfMap1.FindFeatureLayer( "PolyLayer"); 


if (polyArea != null ) 
{

CovertPolygonLayerToZones(zoneDef, polyArea);

MessageBox.Show("Polygon Processing Done." ); 

}
else 

MessageBox.Show("Polygon Processing cannot be Done." );
}


private void CovertPolygonLayerToZones(PolygonZone zoneDef, FeatureLayer polygLayer)

{

polygLayer.FeatureSource.Open();

 

Collection polygfts = polygLayer.FeatureSource.GetAllFeatures(ReturningColumnsType.AllColumns); for (int i = 0; i < polygfts.Count; i++) 
MultipolygonShape mpolyg = (MultipolygonShape)polygfts.GetShape();// type conversion problem: PolygonShape -> MultipolygonShape not allowed


}