WPF C# Tutorial

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="Microsoft.Samples.Graphics.RectangleExample"
    WindowTitle="Example">
  
          Width="50"
      Height="50"
      Stroke="Black"
      StrokeThickness="4"
      Canvas.Left="135"
      Canvas.Top="100" />