Clipping is the process of restricting the display area to a specified shape.
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Canvas xmlns="http://schemas.microsoft.com/client/2007">
<Canvas.Clip>
<EllipseGeometry
Center="100,200"
RadiusX="150"
RadiusY="150"
/>
</Canvas.Clip>
<Ellipse
Fill="LightGray"
Stroke="Black"
StrokeThickness="20"
Width="200"
Height="200"
/>
<Rectangle
Fill="Gray"
Stroke="Black"
StrokeThickness="20"
Canvas.Left="100"
Canvas.Top="100"
Width="200"
Height="200"
/>
</Canvas>
</UserControl>
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