title: How do notification, after download file?
body: <p>The essence of the problem is this: there is a controller, in which is a method that generates an excel file. Upon request by its need to generate and return. The file is generated for a long time for 1-2 hours, while it is necessary to highlight the text notifications, please wait. After finish notification must be removed.</p>
  
  <p>I could not find my desired solutions.</p>
  
  <p>I sory for my bad English</p>
  
  <pre><code>  public ActionResult DownloadFile()
      {
           return new FileStreamResult(_exporter.Export(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
      }
  </code></pre>