private void HandleImage(Image image, Uri webUri)
{
  BitmapDecoder bDecoder = BitmapDecoder.Create(
    webUri, 
    BitmapCreateOptions.PreservePixelFormat, 
    BitmapCacheOption.None);

  if (bDecoder != null && bDecoder.Frames.Count > 0)
    image.Source = bDecoder.Frames[0];
}

• PresentationCore
• PresentationFramework
• WindowsBase

public class App : Application
{
    [STAThread]
    static void Main(string[ args) 
    {
        Application app = new Application();
        app.Run(new MainWindow());
    }
}

public class MainWindow : Window
{
    StackPanel mainPanel = null;
    Label label1 = null;
    Button button1 = null;

    private void InitializeComponent()
    {
        mainPanel = new StackPanel();
        mainPanel.Name = "MainPanel";
        mainPanel.Orientation = Orientation.Vertical;

        label1 = new Label();
        label1.Content = "Code Only App";
        label1.FontSize = 18;

        button1 = new Button();
        button1.Content = "Close";

        mainPanel.Children.Add(label1);
        mainPanel.Children.Add(button1);

        this.Content = mainPanel;
    }

    public MainWindow()
    {
        InitializeComponent();

        Init();

        button1.Click += 
        new RoutedEventHandler(button1_Click);
    }

    void button1_Click(
        object sender, 
        RoutedEventArgs e)
    {
        Application.Current.Shutdown(0);
    }

    private void Init()
    {
        this.Title = "Code Only App";
        this.Height = 300;
        this.Width = 300;
    }
}