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)  // version 1

{
   
int fcount = wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Count; 
  polygLayer.FeatureSource.Open(); 
  IEnumerable allPolygons = polygLayer.FeatureSource .GetAllFeatures(ReturningColumnsType.AllColumns) .OfType (); 
  MultipolygonShape mpolyg = new MultipolygonShape(allPolygons); // nothing found in mpolyg, 
  Collection polyg= mpolyg.Polygons; 

for (int i=0;i<fcount,i++)
 {
  try 
  { 

   Collection<Vertex> vtxs=polyg[i].OuterRing.Vertices; // this caused "Index was out of range" runtime problem 
  } 
  catch (Exception e) 
  { 
	MessageBox.Show(ex.ToString(),"Exception"); 
  } 
 } 
} 


private void ConvertPolygonLayerToZones(PolygonZone zoneDef, FeatureLayer polygLayer)  // version 2

{

int fcount = wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Count;
wpfMap1.TrackOverlay.TrackShapeLayer.FeatureSource.Open();
 
IEnumerable allPolygons = wpfMap1.TrackOverlay.TrackShapeLayer.FeatureSource .GetAllFeatures(ReturningColumnsType.AllColumns).OfType(); 
 MultipolygonShape mpolyg = new MultipolygonShape(allPolygons); // nothing found in mpolyg, 
  Collection polyg= mpolyg.Polygons; 

for (int i=0;i<fcount,i++)
 {
  try 
  { 

   Collection<Vertex> vtxs=polyg[i].OuterRing.Vertices; // this caused "Index was out of range" runtime problem 
  } 
  catch (Exception e) 
  { 
	MessageBox.Show(ex.ToString(),"Exception"); 
  } 
 } 
} 
// The save button is clicked to save the polygon drawn on the map.
// I have tried version 1 and version 2 of the method but same exception happens. It seems that the multipolygonshape
// instance doesn't contain any info on the polygon drawn on the map, which is supposed to be
// captured either by my trackOverlay_TrackEnded method or captured internally by ThinkGeo TrackShapeLayer.
// Please point out mistakes in the code and indicate the corrections accordingly. Thanks.