winform 程序怎么样实现自动升级

 看看这段代码。。。

private void btnUpdate_Click(object sender, EventArgs e)
    {
    try
    {
    WebClient webClient = new WebClient();
    webClient.DownloadFile("http://localhost/Web/update.txt", "update.txt");

    StreamReader sr = new StreamReader("update.txt");

    List<UpdateFile> files = new List<UpdateFile>();

    string version = sr.ReadLine();
    //将应用程序更名拷贝
    File.Copy(@"MyGame.exe", "MyGame_old.exe", true);
    //反射备份的应用程序 得到版本号
    Assembly assembly = Assembly.LoadFile(Application.StartupPath + @"\MyGame_old.exe");
    string currentVersion = assembly.GetName().Version.ToString();
    assembly = null;
    //如果版本号不一致 升级程序
    if (currentVersion != version)
    {
    //读出有几个文件需要更新
    int newFileCount = int.Parse(sr.ReadLine());

    for (int i = 0; i < newFileCount; i++)
    {
    //取得文件下载路径和文件名
    UpdateFile updateFile = new UpdateFile();
    updateFile.FileName = sr.ReadLine();
    updateFile.DownLoadPath = sr.ReadLine();
    files.Add(updateFile);
    }

    foreach (UpdateFile file in files)
    {
    WebClient webClientNew = new WebClient();
    //更新每个文件 - 注意web服务器的配置
    webClientNew.DownloadFile(file.DownLoadPath, file.FileName);
    }
    MessageBox.Show("升级成功！");
    }
    else
    {
    MessageBox.Show("您的游戏已经是最新版本！");
    }
    }
    catch (Exception ex)
    {
    MessageBox.Show(ex.ToString());
    }
    }

/// <summary>
    /// 保存要更新的文件名和下载路径
    /// </summary>
    public class UpdateFile
    {
    private string fileName;
    public string FileName
    {
    get { return fileName; }
    set { fileName = value; }
    }
    private string downLoadPath;
    public string DownLoadPath
    {
    get { return downLoadPath; }
    set { downLoadPath = value; }
    }

    }