WPF C# Tutorial

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="Microsoft.Samples.Graphics.RectangleExample"
    WindowTitle="Example">
  
          X1="10" Y1="10"
      X2="50" Y2="50"
      Stroke="Black"
      StrokeThickness="4" />