MARKUS

                PathGeometry pathGeometry = new PathGeometry();

                PathFigure pathFigure = new PathFigure();

                PolyLineSegment instance = new PolyLineSegment();

                foreach (var Inneritem in PointSet)

                {

                    instance.Points.Add(Inneritem);

                }

                StartPoint = instance.Points.First();

                pathFigure.StartPoint = StartPoint;

                EndPoint = instance.Points.Last();