public void CreatePline()
{
Point2d[] pt = new Point2d[4];
pt[0] = new Point2d(0, 0);
pt[1] = new Point2d(10, 0);
pt[2] = new Point2d(30, 20);
pt[3] = new Point2d(-20, 50);
Point2dCollection pts = new Point2dCollection(pt);
ObjectId plineId = ModelSpace.AddPline(pts, 0);
}
