первое приложение

[the_deer_one]

Делаю всё по книжке, а оно заразо не компилируется.
Я добавил в проект:
PresentationCore;
PresentationFramework;
System;
WindowsBase;

using System;
using System.Windows;

class program
{
    [STAThread]
    public static void Main()
    {
        Application app = new Application();
        Window window = new Window();
        window.Title = "new items";
        app.exec();
    }
}

Ошибки:
'System.Windows.Application' does not contain a definition for 'exec' and no extension method 'exec' accepting a first argument of type 'System.Windows.Application' could be found (are you missing a using directive or an assembly reference?)

The type 'System.Windows.Markup.IQueryAmbien t' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

[the_deer_one]

System.Xaml не хватало.