Fills the polylines with a light gray color
<Window x:Class="WpfApplication1.Polygons" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Polygons" Height="300" Width="300"> <Grid> <StackPanel Name="stackPanel1" Margin="10"> <TextBlock Text="Polygon:" /> <Polygon Stroke="Black" StrokeThickness="3" Fill="LightGray" Points="0 170,60 110,180 60,160 110,210 170" /> <TextBlock Text="Filled sine curve:" Margin="0 10 0 0" /> <Polygon Name="polygon1" Stroke="Red" StrokeThickness="2" Fill="LightCoral" /> </StackPanel> </Grid> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Media; using System.Windows.Shapes; namespace WpfApplication1 { public partial class Polygons : Window { public Polygons() { InitializeComponent(); for (int i = 0; i < 71; i++) { double x = i * Math.PI; double y = 40 + 30 * Math.Sin(x / 10); polygon1.Points.Add(new Point(x, y)); } } } }