public HttpResponseMessage Post()
        {
            HttpResponseMessage result = null;
            var httpRequest = HttpContext.Current.Request;
            // Check if files are available
            if (httpRequest.Files.Count > 0)
            {
                var files = new List<string>();
                var filePath = string.Empty;
                // interate the files and save on the server
                foreach (string file in httpRequest.Files)
                {
                    var postedFile = httpRequest.Files[file];
                    filePath = HttpContext.Current.Server.MapPath(@"~App_Data/" + postedFile.FileName);
                    postedFile.SaveAs(filePath);
                    files.Add(filePath);
                }

                // return result
                result = Request.CreateResponse(HttpStatusCode.Created, files);
                DropboxUpload.UploadInDropbox(files[0]);
            }
            else
            {
                // return BadRequest (no file(s) available)
                result = Request.CreateResponse(HttpStatusCode.BadRequest);
            }

            return result;
        }