LineGeometry

   
    

<Window x:Class="Workspace.DockExample"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Workspace" Width="640" Height="480">
          <Path Stroke="Black" StrokeThickness="1">
            <Path.Data>
              <LineGeometry StartPoint="10,10" EndPoint="50,30" />
            </Path.Data>
          </Path>

</Window>