Draw arrow shape using code behind approach

i have been trying to draw arrows  using coding behind approach and path  function . however it

 is giving me error . i am inserting the code here

 Path orangePath = new Path();

            PathFigure pathFigure = new PathFigure();

            pathFigure.StartPoint = new Point(0,0);

//  drawing stratight line          
  LineSegment lineSegment1 = new LineSegment();
            lineSegment1.Point = new Point(10,0);
            pathFigure.Segments.Add(lineSegment1);

//drawing top half of arrow

            LineSegment lineSegment2 = new LineSegment();
            lineSegment2.Point = new Point(5,-5);
            pathFigure.Segments.Add(lineSegment2);

//coming back to the same position . its here where ERROR is happening .instead of coming back to the arrowhead it is adding to it .


            LineSegment lineSegment3 = new LineSegment();
            lineSegment3.Point = new Point(10,0);
            pathFigure.Segments.Add(lineSegment3);

// drawing the bottom half of the arrow           
 LineSegment lineSegment4 = new LineSegment();
            lineSegment4.Point = new Point(5,5);
            pathFigure.Segments.Add(lineSegment4);


            PathGeometry pathGeometry = new PathGeometry();
            pathGeometry.Figures = new PathFigureCollection();

            pathGeometry.Figures.Add(pathFigure);

            orangePath.Data = pathGeometry;
            orangePath.Stroke = System.Windows.Media.Brushes.Black;
            orangePath.StrokeThickness=2;
            orangePath.Margin = new Thickness(20, 20, 20, 20);

            grid1.Children.Add(orangePath);

1. what is the error here ?  is  there any third party dll  to help the situation  ?

arka Bhattacharya