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The following returns a PDF which the browser tries to directly display inline. This works correctly. However, if I try to download the file, the download name is not "myPDF.pdf", but instead the ID in the route (myapp/controller/PDFGenerator/ID). Is it possible to set the file download name to be "myPDF.pdf"?

public FileStreamResult PDFGenerator(int id)
    MemoryStream ms = GeneratePDF(id);
    byte[] file = ms.ToArray();
    MemoryStream output = new MemoryStream();
    output.Write(file, 0, file.Length);
    output.Position = 0;
    HttpContext.Response.AddHeader("content-disposition", 
    "inline; filename=myPDF.pdf");
    return File(output, "application/pdf", fileDownloadName="myPDF.pdf");
No, this is not possible with a PDF displayed inline. You could achieve this if you send the Content-Disposition header with as an attachment:
public ActionResult PDFGenerator(int id)
    Stream stream = GeneratePDF(id);
    return File(stream, "application/pdf", "myPDF.pdf");
Also notice how I removed the unnecessary MemoryStream you were using and loading the PDF in memory where you could have directly streamed it to the client which would have been far more efficient.
                Yes, that was the whole point of my answer. If you want the file to be displayed inline you cannot specify a filename. If you display the PDF file inline, it is opened with the plugin associated on the client machine to open PDF files. Behavior will vary between the various plugins.
– Darin Dimitrov
                Apr 7, 2013 at 13:09
                @Nalan M answer could force it to download, in most cases. So, it shouldn't be said as not possible.
– Syakur Rahman
                Feb 26, 2016 at 9:05
If you are using FileStreamResult to download the file, try using this in controller 
Response.ContentType = "application/pdf";
Response.AddHeader("Content-Disposition", "attachment; filename=FileName.pdf");
                On of my exporting to PDF actions returns data as plain text replacing iframe instead of attachment type. I had to add these two lines to force it to popup the save dialog.
– OldTrain
                Apr 9, 2015 at 6:33
It is possible by making the id a string which represents the file name without the extension.
public ActionResult PDFGenerator(string id, int? docid)
    Stream stream = GeneratePDF(docid);
    return new FileStreamResult(stream , "application/pdf");
The url then then end like this   
  ..PDFGenerator/Document2?docid=15
        
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