Mapcontrol not reflected when i split polygon with line?

I have created a split tool which will create polyline and based this line i want to divide that polygon into two separate polygons.
i have write below code it will create left side and right side geometry very well but that newly created polygon not reflected in mapcontrol.
what i am doing wrong here?
also i attached image of my polygon.
Code:
IMap map1;
IFeature feat;
IFeature outfet;
IFeatureClass outfeturecls;
IFeatureLayer feturelyyr;
IGeometry left;
IGeometry right;
IEnumFeature enumfeture;


screenDisplay.StartDrawing(screenDisplay.hDC, (System.Int16)ESRI.ArcGIS.Display.esriScreenCache.esriNoScreenCache); // Explicit Cast
ESRI.ArcGIS.Display.IRgbColor rgbColor = new ESRI.ArcGIS.Display.RgbColorClass();
rgbColor.Blue = 255;

ESRI.ArcGIS.Display.IColor color = rgbColor; // Implicit Cast
ESRI.ArcGIS.Display.ISimpleLineSymbol simpleLineSymbol = new ESRI.ArcGIS.Display.SimpleLineSymbolClass();
simpleLineSymbol.Color = color;
ESRI.ArcGIS.Display.ISymbol symbol = (ESRI.ArcGIS.Display.ISymbol)simpleLineSymbol; // Explicit Cast
ESRI.ArcGIS.Display.IRubberBand rubberBand = new ESRI.ArcGIS.Display.RubberLineClass();
IPolyline newPolyline = (IPolyline)rubberBand.TrackNew(screenDisplay, (ESRI.ArcGIS.Display.ISymbol)symbol);
IGeometry polggeomtry=null;
IGeometry polylingeo = null;
map1 = m_hookHelper.FocusMap;
enumfeture = map1.FeatureSelection as IEnumFeature;


feat = enumfeture.Next();
polylingeo = newPolyline as IGeometry;
while (feat != null)
{
if (feat.Shape.GeometryType == esriGeometryType.esriGeometryPolygon)
{


polggeomtry = feat.ShapeCopy as IGeometry;

break;

}
}

feturelyyr = Program.lyrr as IFeatureLayer;
outfeturecls = feturelyyr.FeatureClass;
ESRI.ArcGIS.Geometry.ITopologicalOperator4 topologicalOperator = polggeomtry as ESRI.ArcGIS.Geometry.ITopologicalOperator4; // Dynamic Cast

topologicalOperator.Simplify();

topologicalOperator.Cut(polylingeo as IPolyline, out left, out right);

IGeometryCollection geometryCollection = (IGeometryCollection)new GeometryBag();


geometryCollection.AddGeometry(left, ref before, ref after);
geometryCollection.AddGeometry(right, ref before, ref after);
for (int i = 0; i < geometryCollection.GeometryCount;i++)
{
outfet = outfeturecls.CreateFeature();
outfet.Shape = geometryCollection.Geometry[i];

outfet.Store();
}
feat.Delete();

Attached Thumbnails