Code

 List<ElementTemplate> outlines = new List<ElementTemplate>();
        outlines.Add(new LineTemplate(points[0].X , points[0].Y , points[1].X , points[1].Y ));
        for (int i = 1; i < points.Count - 1; i++)
        {
          outlines.Add(new LineTemplate(points[i].X , points[i].Y , points[i + 1].X , points[i + 1].Y ));
        }

        Shape shape = new Shape(outlines.ToArray(), System.Drawing.Drawing2D.FillMode.Winding, "outline");

        ShapeNode shapeNode = diagram2.Factory.CreateShapeNode(0,0,100,100,shape);