CSV encoding issues (Microsoft Excel)

Question

I am dynamically creating CSV files using C#, and I am encountering some strange encoding issues. I currently use the ASCII encoding, which works fine in Excel 2010, which I

Answer 1

You need to add Preamble to file:

        var data = Encoding.UTF8.GetBytes(csv);
        var result = Encoding.UTF8.GetPreamble().Concat(data).ToArray();
        return File(new MemoryStream(result), "application/octet-stream", "file.csv");