Statements that need to be added when downloading after using ajax

  protected void Page_Load(object sender, EventArgs e)
    {
        ScriptManager.GetCurrent(this.Page).RegisterPostBackControl(ImageButton1/*下载按钮的ID*/);
    }
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        UpdownAndUpFileMeiliao.FileDownLoad("ceo.doc");