找不到类型或命名空间名称“Ad”

Question

http://geekswithblogs.net/cwilliams/archive/2011/03/20/144452.aspx

我尝试了本教程，但总是收到以下三条错误消息：

  

找不到类型或命名空间名称“Ad”（您是否缺少using指令或程序集引用？）

     

找不到类型或命名空间名称“AdManager”（您是否缺少using指令或程序集引用？）

     

当前上下文中不存在名称“RotationMode”

有什么问题？我已经添加了“使用Microsoft.Advertising.Mobile.Xna;”，但我总是收到这些错误消息。

如何在XNA Windows Phone游戏中使用pubcenter广告？

public class Game1 : Microsoft.Xna.Framework.Game
{
    GraphicsDeviceManager graphics;
    SpriteBatch spriteBatch;
    private const string AppID = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
    private const string AdUnitID = "xxxxx";
    AdManager adManager;
    Ad bannerAd;

    public Game1()
    {
        graphics = new GraphicsDeviceManager(this);
        Content.RootDirectory = "Content";
        TargetElapsedTime = TimeSpan.FromTicks(333333);
        InactiveSleepTime = TimeSpan.FromSeconds(1);
        graphics.IsFullScreen = true;
    }

    protected override void Initialize()
    {
        adManager = new AdManager(this, AppID);
        adManager.TestMode = false;  
        Components.Add(adManager);
        base.Initialize();
    }

    protected override void LoadContent()
    {
        spriteBatch = new SpriteBatch(GraphicsDevice);
        bannerAd = adManager.CreateAd(AdUnitID, new Rectangle(0, 20, GraphicsDevice.Viewport.Bounds.Width, 120), RotationMode.Manual, false);
    }

    protected override void Update(GameTime gameTime)
    {
        base.Update(gameTime);
    }

    protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(Color.CornflowerBlue);
        base.Draw(gameTime);
    }
}