/// <summary>
        /// Uses information in the dto to send notifications.
        /// </summary>
        /// <param name="dto">Dto containing notification information.</param>
        /// <returns>Task that returns the command result.</returns>
        public async Task <CommandResultNoDto> SendNotification(NotificationDto dto)
        {
            var validationResult = _validator.Validate(dto);

            if (validationResult.IsInvalid)
            {
                return(new CommandResultNoDto(validationResult));
            }

            if (dto.BroadcastAll)
            {
                await _notificationSender.SendAll(dto.Message);
            }
            else
            {
                await _notificationSender.SendGroup(dto.GroupName, dto.Message);
            }

            return(new CommandResultNoDto(FacadeStatusCode.Ok));
        }