/// <summary>
        /// 点击下载按钮之后,跳转到相应的应用市场
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnDownload_Click(object sender, EventArgs e)
        {
            var mobileDetect = new MobileDetect(Context);

            if (mobileDetect.IsAndroid())
            {
                Response.Redirect("http://s1.music.126.net/download/android/CloudMusic_official_3.6.0.143673.apk");
            }
            if (mobileDetect.IsApple())
            {
                Response.Redirect("https://itunes.apple.com/app/id590338362");
            }
            if (mobileDetect.IsWindowsMobile())
            {
                Response.Redirect("https://www.microsoft.com/store/apps/9nblggh6g0jf");
            }
        }
        void context_BeginRequest(object sender, EventArgs e)
        {
            //如果请求中的Cookie包含NoThanks键或者上一次请求来自下载插入页或者当前请求就是下载插入页,那么直接返回
            if (ExistNoThanksCookie() || ComingFromMobileInterstitial() || OnMobileInterstitial())
            {
                return;
            }
            var context = HttpContext.Current;
            //使用当前上下文对象创建一个MobileDetect对象
            var mobileDetect = new MobileDetect(context);

            if (mobileDetect.IsMobile())
            {
                //如果用户拒绝下载APP,那么我们需要将他跳转回之前访问的页面
                var url       = context.Request.RawUrl;
                var encodeUrl = HttpUtility.UrlEncode(url);
                //重定向到下载插入页,并带上returnUrl,以防用户需要返回到之前的页面
                context.Response.Redirect("MobileInterstitial.aspx?returnUrl=" + encodeUrl);
            }
        }