public async Task <short> PutStateRepository(int _id, State _state)
        {
            if (_id != _state.Id)
            {
                return(1); //bad request
            }

            _context.Entry(_state).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!StateExists(_id))
                {
                    return(2); //not found
                }
                else
                {
                    throw;
                }
            }

            return(3); //no content
        }