//C#
private void SelectByShape(IGeometry searchShape, IFeatureLayer searchTarget)
        {  
            //set up the spatial filter

t.FeatureClass;
            ISpatialFilter spatialFilter = new Spat
            IFeatureClass featureClass = searchTarg
eialFilterClass();
            spatialFilter.Geometry = searchShape;

;
            spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatia
            spatialFilter.GeometryField = featureClass.ShapeFieldNam
elRelIntersects;

            IFeatureSelection featureSelection = searchTarget as IFeatureSelection;

  esriSelectionResultEnum.esriSelectionResultNew,
         
            featureSelection.SelectFeatures(spatialFilter, 
                                         
                                    false);

            //Fire the selection changed event
            featureSelection.SelectionChanged();


                                        
            //Refresh the visible extent
            this.axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, 
  
               searchTarget, 
                                                         this.axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.VisibleBounds);


        }


hape, selectionEnvironmet, fals
//Ex2 using IMap::SelectByShape

rivate void SelectByShape(IGeometry searchShape, IMap map, ISelectionEnvironment selectionEnvironmet)
        {
            map.SelectByShape(search
Se);

            //Refresh the visible extent
            this.axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, 

}
                                                         this.axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.VisibleBounds);