Save output contoure(Polyline) to a feature class/shapefile and display in map

[BingZhu]

Hi,

I'm using RasterSurfaceOpClass() class to output a contour from a point as following code:

            ISurfaceOp surfaaceOp = new RasterSurfaceOpClass();
            IPolyline outContour ;
            double ele;
            surfaaceOp.ContourAsPolyline((IGeoDataset)_demRasterLayer, points.get_Point(0), out outContour, out ele);

How do I save the output outContour to a featureclass/shapefile and display it on the map?

Thanks