I am returning File result from action triggered by the form post event. I can't get download dialog. Instead, if I use:

return File(Encoding.UTF8.GetBytes(reportPath), "text/plain", "Report.csv");

I get path to the file upon ajax execution in the target div.

When I use

return File(reportPath, "text/plain", "Report.csv");

I get content of the file in the target div.

Any thoughts ?

The action is declared as

   [HttpPost]
   public virtual ActionResult ExportFilter(Model model) {
      string outputFile = CreateReport(model);
      return File(....)
   }