public IHttpActionResult Putuser(decimal id, user user)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != user.User_id)
            {
                return BadRequest();
            }

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

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!userExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult Postuser(user user)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.users.Add(user);

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateException)
            {
                if (userExists(user.User_id))
                {
                    return Conflict();
                }
                else
                {
                    throw;
                }
            }

            return CreatedAtRoute("DefaultApi", new { id = user.User_id }, user);
        }