// PUT api/Roles/5
        public HttpResponseMessage Putroles(int id, roles roles)
        {
            if (!ModelState.IsValid)
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }

            if (id != roles.id)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }

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

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK);
        }
        // POST api/Roles
        public HttpResponseMessage Postroles(roles roles)
        {
            if (ModelState.IsValid)
            {
                db.roles.Add(roles);
                db.SaveChanges();

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, roles);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = roles.id }));
                return response;
            }
            else
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }
        }