在asp.net中自动下载文件后，HTML没有更改

Question

我试图在点击按钮后自动下载文件后显示成功消息（在PostBack之后）。代码是：

divMessage.InnerHtml = "Your download should start automatically. If it doesn't, click <a alt='" +
                                       DownloadObject.Title + "' href='" +  DownloadObject.Url + "' target='_blank'>here</a>";
divMessage.Attributes.Add("class", "alert alert-success");



//Start downloading the file automatically
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment;filename=" + downloadableFileUrl.TrimStart('/'));

Response.TransmitFile(DownloadObject.Url);
Response.End();

HTMl没有任何反应，但文件已成功下载。是否有任何解决方法可以在UI中显示成功消息？