// POST api/Contacts
        public HttpResponseMessage PostContact(Contact contact)
        {
            if (ModelState.IsValid)
            {
                db.Contacts.Add(contact);
                db.SaveChanges();

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, contact);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = contact.ContactId }));
                return response;
            }
            else
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }
        }
        // PUT api/Contacts/5
        public HttpResponseMessage PutContact(int id, Contact contact)
        {
            if (ModelState.IsValid && id == contact.ContactId)
            {
                db.Entry(contact).State = EntityState.Modified;

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

                return Request.CreateResponse(HttpStatusCode.OK);
            }
            else
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }
        }