public HttpResponseMessage PostP_Notas(P_Notas p_notas)
        {
            if (ModelState.IsValid)
            {
                db.P_Notas.Add(p_notas);
                db.SaveChanges();

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, p_notas);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = p_notas.IdPersona }));
                return response;
            }
            else
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }
        }
        public HttpResponseMessage PutP_Notas(int id, P_Notas p_notas)
        {
            if (ModelState.IsValid && id == p_notas.IdPersona)
            {
                db.Entry(p_notas).State = EntityState.Modified;

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

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