Return a file content from asp.net webapi action

getFile.cs

        public HttpResponseMessage GetText()
        {
            try
            {
                string content = "Hello";

                HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
                result.Content = new StringContent(content);
                //a text file is actually an octet-stream (pdf, etc)
                result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                //we used attachment to force download
                result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
                result.Content.Headers.ContentDisposition.FileName = "mytext.txt";
                return result;

            }
            catch (Exception ex)
            {
                throw new HttpResponseException(HttpStatusCode.InternalServerError);
            }

        }