WPF VB.Net Tutorial

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="Microsoft.Samples.Graphics.RectangleExample"
    WindowTitle="Rectangle Example">
  
            Width="100"
      Height="50"
      RadiusX="20"
      RadiusY="20"
        Stroke="Black"
        StrokeThickness="4"
        Canvas.Left="135"
      Canvas.Top="100" />