public IHttpActionResult PutAccount(int id, Account account)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != account.Id)
            {
                return BadRequest();
            }

            db.Accounts.Update(account);

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

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult PostAccount(Account account)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Accounts.Add(account);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = account.Id }, account);
        }