Polyline with OuterGlowBitmapEffect
<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="230" Width="500">
<Canvas Margin="10">
<Polyline Canvas.Left="0" Canvas.Top="40"
Margin="10" Stroke="Black" StrokeThickness="5"
Points="10,10 100,10 100,100 10,100 0,20 80,20 80,180 20,80, 120,40 60,40 160,60 140,60" >
<Polyline.BitmapEffect>
<OuterGlowBitmapEffect GlowColor="Blue" GlowSize="10" />
</Polyline.BitmapEffect>
</Polyline>
</Canvas>
</Window>
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