// POST: api/links
        // Input example: { "Title": "Products", "URL": "http://pr.com", "Cathegory": "Electronics"}
        public HttpResponseMessage PostLinkToDB([FromBody] Link link)
        {
            HttpResponseMessage response = null;

            if (ModelState.IsValid)
            {
                try
                {
                    var addedLink = service.AddLink(link);

                    response = Request.CreateResponse(
                        HttpStatusCode.Created, addedLink);

                    string uri = Url.Link("DefaultApi", new { id = addedLink.LinkID });
                    response.Headers.Location = new Uri(uri);
                    return(response);
                }
                catch (Exception ex)
                {
                    Trace.TraceError(ex.Message, ex);
                    response = Request.CreateResponse <string>(HttpStatusCode.InternalServerError, ex.Message);
                }
            }
            else
            {
                return(Request.CreateResponse(HttpStatusCode.BadRequest));
            }
            return(PrepareResponse(HttpStatusCode.OK, "Successfully added"));
        }