public HttpStatusCodeResult PostContact(Contact contact)
        {
            if (!ModelState.IsValid)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest, "Bad Request");
            }

            db.Contact.Add(contact);
            db.SaveChanges();

            return new HttpStatusCodeResult(HttpStatusCode.OK, "OK");
        }
        public HttpStatusCodeResult PutContact(int id, Contact contact)
        {
            if (!ModelState.IsValid)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest, "Bad Request");
            }

            if (id != contact.ContactId)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest, "Bad Request");
            }

            db.Entry(contact).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!ContactExists(id))
                {
                    return new HttpStatusCodeResult(HttpStatusCode.NotFound, "Not Found");
                }
                else
                {
                    throw;
                }
            }

            return new HttpStatusCodeResult(HttpStatusCode.NoContent, "No Content");
        }