// POST api/<controller>
        public HttpResponseMessage Post(Hello hello)
        {
            
            db.Helloes.Add(hello);
            db.SaveChanges();

            var response = Request.CreateResponse<Hello>(HttpStatusCode.Created, hello);
            
            string uri = Url.Link("DefaultApi", new { id = hello.helloID });
            response.Headers.Location = new Uri(uri);
            return response;
        }
        public HttpResponseMessage Put(string put, Hello hello)
        {
            if (ModelState.IsValid)
            {
                db.Entry(hello).State = EntityState.Modified;

                try
                {
                    db.SaveChanges();
                }
                catch (DbUpdateConcurrencyException)
                {
                    return Request.CreateResponse(HttpStatusCode.NotFound);
                }

                return Request.CreateResponse<Hello>(HttpStatusCode.OK,hello);
            }
            else
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }
        }