Redirect / show view after generated file is dowloaded

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As Ross has said, you can only return one response to a HTTP request.
What i do in that case is:

  1. Send the request to the server
  2. The server generates the file and stores it in some server side data structure (Cache, Usersession, TempData)
  3. The server returns a RedirectToAction() (POST, REDIRECT, GET pattern)
  4. The redirected action returns a View with some javascript which
  5. Triggers the download of the pregenerated file by setting window.location.href property to an special download action which sends the file back to the browser

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