FormMap.cs

rivate void btnSelectShapeFile_Click(object sender, EventArgs e)
        {
            if (dlgShapefile.ShowDialog(this) == DialogResult.OK)
            {
                shapeFileName = dlgShapefile.FileName;
                if (shapeFileName != null)
                {
                    using (Shapefile shapefile = new Shapefile(shapeFileName))

                        foreach (Shape shape in shapefile)
                        {
                            switch (shape.Type)
                            {
                                case ShapeType.Point:
                                    // a point is just a single x/y point
                                    ShapePoint shapePoint = shape as ShapePoint;
                                    //Console.WriteLine("Point={0},{1}", shapePoint.Point.X, shapePoint.Point.Y);
                                    break;

                                case ShapeType.Polygon:
                                    // a polygon contains one or more parts - each part is a list of points which
                                    // are clockwise for boundaries and anti-clockwise for holes 
                                    // see http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf
                                    ShapePolygon shapePolygon = shape as ShapePolygon;
                                    foreach (PointD[] part in shapePolygon.Parts)
                                    {
                                        var points = new List<GeoPoint>();
                                        var polygon = new Polygon(PolygonStyle.Default);

                                        foreach (PointD point in part)
                                        {
                                            points.Add(new GeoPoint((float)point.X, (float)point.Y));
                                        }
                                        polygon.AddRange(points);
                                        mapControl.Polygons.Add(polygon);
                                    }
                                    break;

                                default:
                                    // and so on for other types...
                                    break;
                            }
                            
                            mapControl.Refresh();
                        }
                }
            }

        }
    }