public async Task <IActionResult> PutPosMsg(long id, PosMsg posMsg)
        {
            if (id != posMsg.Id)
            {
                return(BadRequest());
            }

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

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!PosMsgExists(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(NoContent());
        }
        public async Task <ActionResult <PosMsg> > PostPosMsg(PosMsg posMsg)
        {
            _context.PosMsg.Add(posMsg);
            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateException)
            {
                if (PosMsgExists(posMsg.Id))
                {
                    return(Conflict());
                }
                else
                {
                    throw;
                }
            }

            return(CreatedAtAction("GetPosMsg", new { id = posMsg.Id }, posMsg));
        }