Draw a Sequence of Connected Lines

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<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="270" Width="300" Loaded="Window_Loaded">
    <Canvas>
        <TextBlock Canvas.Top="40" Canvas.Left="20"
                   FontSize="14" Text="Static Points Collection" />
        <Polyline Stroke="Black" StrokeThickness="3" 
                  Points="0,0 300,10 300,10 10,10 10,25
                  250,250 255,85 250,40 205,85 200,40 155,85 35,90" />
        <TextBlock Canvas.Top="150" Canvas.Left="20" Text="Programmatic Points Collection" />
        <Polyline Name="plLine" Stroke="Black" StrokeThickness="3" />
    </Canvas>
</Window>
//File:Window.xaml.cs
using System.Windows;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
         
            plLine.Points.Add(new Point(10, 140));
            plLine.Points.Add(new Point(270, 140));
            plLine.Points.Add(new Point(10, 175));
            plLine.Points.Add(new Point(10, 220));
            plLine.Points.Add(new Point(125, 220));
        }
    }
}