public override async Task <Users> GetAll(Empty request, ServerCallContext context)
        {
            try
            {
                var result = new Users();
                var datas  = await _coreService.GetAll();

                foreach (var data in datas)
                {
                    result.Value.Add(new User
                    {
                        Code       = data.Code,
                        DisplayKey = data.DisplayKey,
                        OrderNo    = data.OrderNo
                    });
                }

                return(result);
            }
            catch (Exception)
            {
                return(null);
            }
        }