添加多个视频

我在游戏中添加多个视频时遇到了巨大的困难。在显示菜单之前，第一个视频完美地播放(introVid)。一旦我按下开始，而不是显示第二个视频(在level0加载之前)，我得到一个错误，说vidTexture2是NULL。

有没有人知道如何添加多个视频?下面是视频管理器类的代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using TileEngine;
using Microsoft.Xna.Framework.Media;
using System.Diagnostics;
namespace TimerGame.VideoManagers
{
    public class Video1Manager
    {
        #region Declarations

        public Video introVid, cineVid;
        public VideoPlayer vidPlayer, vidPlayer2;
        public Texture2D vidTexture, vidTexture2;
        public Rectangle vidRectangle, vidRectangle2;

        #endregion
        #region Initialization

        public void Initialize(ContentManager Content)
        {
            try
            {
                vidPlayer = new VideoPlayer();
                vidPlayer2 = new VideoPlayer();
                introVid = Content.Load<Video>(@"Videos'TimerIntro");
                vidRectangle = new Rectangle(-225, 0,
                                            1250, 600);
                cineVid = Content.Load<Video>(@"Videos'Cinematic1");
                vidRectangle2 = new Rectangle(0, 0, 800, 600);
            }
            catch { Debug.Write("Video Manager Failed"); }
        }
        public void PlayIntro()
        {
            try { vidPlayer.Play(introVid); }
            catch { Debug.Write("IntroVid Failed"); }
        }
        public void PlayCine1()
        {
            try { vidPlayer2.Play(cineVid); }
            catch { Debug.Write("Cinematic1 Failed"); }
        }

        #endregion
    }
}

和标志性图示:

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;
using TileEngine;
using TimerGame.MenuButtons;
using TimerGame.LevelManagers;
using TimerGame.VideoManagers;
namespace TimerGame
{
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        Player player;
        SpriteFont pericles10;
        //MENU
        ...
        Video1Manager videoManager;
        //Levels
        int currentLevel = -1;
        int state = 0;

        ...

        protected override void Initialize()
        {
            videoManager = new Video1Manager();
            ...
        }

        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);

         ...
            //Video
            videoManager.Initialize(Content);
            if (state == 0)
                videoManager.PlayIntro();

            ...

        }
        protected override void Update(GameTime gameTime)
        {
            ...
            switch (state)
            {
                case 0:
                    if (keyState.IsKeyDown(Keys.Escape))
                    {
                        videoManager.vidPlayer.Stop();
                        state = 1;
                    }
                    if (videoManager.vidPlayer.State == MediaState.Stopped)
                    {
                        state = 1;
                        MediaPlayer.Play(menuMusic);
                    }
                    break;
                case 1:
                    ...
                        #region Playing
                        case GameState.Playing:
                            IsMouseVisible = false;
                            ...
                                switch (currentLevel)
                                {
                                    case 0:
                                        videoManager.PlayCine1();
                                        if (videoManager.vidPlayer2.State == MediaState.Stopped)
                                        {
                                            currentLevel++;
                                            Level0Manager.LoadLevel();
                                        }
                                        break;
                                    case 1:
                                        player.Update(gameTime);
                                        Level0Manager.Update(gameTime);
                                        if (Level0Manager.LevelComplete)
                                        {
                                            currentLevel++;
                                        }
                                        break;
                                    ...some code
                        #endregion
                    }
                    break;
            }
            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.Black);

            videoManager.vidTexture = videoManager.vidPlayer.GetTexture(); //Video TEXTURE            

            spriteBatch.Begin(
                SpriteSortMode.BackToFront,
                BlendState.AlphaBlend);            
            switch (state)
            {
                case 0:
                    spriteBatch.Draw(videoManager.vidTexture, videoManager.vidRectangle, Color.White);
                    break;
                case 1:
                    switch (gameState)
                    {
                        #region Menu Draw
                        ...
                            break;
                        #endregion
                        #region Playing Draw
                        case GameState.Playing:
                            MediaPlayer.Stop();
                            //spriteBatch.DrawString(pericles10, "12:20", new Vector2(100, 20), Color.Red);
                            TileMap.Draw(spriteBatch);
                            switch (currentLevel)
                            {
                                case 0:
                                    videoManager.vidTexture2 = videoManager.vidPlayer2.GetTexture();                                    
                                    spriteBatch.Draw(videoManager.vidTexture2, videoManager.vidRectangle2, Color.White);
                                    break;
                                case 1:
                                    player.Draw(spriteBatch);
                                    Level0Manager.Draw(spriteBatch);
                                    break;
                                ....other code
                            break;
                        #endregion
                    }
                    break;
            }
            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}