public override async Task <User> Get(UserCode request, ServerCallContext context)
        {
            try
            {
                var data = await _coreService.GetByCode(request.Code);

                return(new User
                {
                    Code = data.Code,
                    DisplayKey = data.DisplayKey,
                    OrderNo = data.OrderNo
                });
            }
            catch (Exception)
            {
                return(null);
            }
        }