How to make sure my created filedownload is UTF-8? (and not UTF-8 without BOM)

Question

i\'ve made a download function to download messages to a CSV file (code is below). Now when i open it up in notepad or notepad++ i see this:

é NY ø ╬ ║► ░ ê ö

(

Answer 1

Zareth's answer helped the OP, but it didn't actually answer the question. Here's the correct solution, from this other post:

public ActionResult Download()
{
    var data = Encoding.UTF8.GetBytes("some data");
    var result = Encoding.UTF8.GetPreamble().Concat(data).ToArray();
    return File(result, "application/csv", "foo.csv");
}

The byte-order mark (while not technically required for UTF8) clues certain programs (e.g. Excel >2007) in to the fact that you're using UTF8. You have to manually include it via the GetPreamble() method.