Download from web service as an attachment

Download.cs

private static HttpResponseMessage DownloadResponse(string content, string fileName)
{
    var downloadContent = new StringContent(content);

    var mediaType = new MediaTypeHeaderValue("application/octet-stream");
    var dispostition = new ContentDispositionHeaderValue("attachment") { FileName = fileName };

    downloadContent.Headers.ContentType = mediaType;
    downloadContent.Headers.ContentDisposition = dispostition;
    
    var result = new HttpResponseMessage(HttpStatusCode.OK)
    {
        Content = downloadContent
    };

    return result;
}