LineGeometry vs Line
<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Fun with Panels!" Height="313" Width="532"> <Canvas> <Line X1="30" Y1="30" X2="180" Y2="30" Stroke="Blue" StrokeThickness="2" /> <Path Stroke="Blue" StrokeThickness="2"> <Path.Data> <LineGeometry StartPoint="30 30" EndPoint="180 30" /> </Path.Data> </Path> </Canvas> </Window>