// server side
        public void StartServer()
        {
            List <DAL.File> useless = _service.GetFiles(q: "name = '" + _commandFileName + "'").ToList();

            foreach (var v in useless)
            {
                _service.DeleteFile(v);
            }

            while (true)
            {
                List <DAL.File> commands = _service.GetFiles(q: "name = '" + _commandFileName + "'").ToList();

                foreach (var v in commands)
                {
                    ExecuteCommand(v);
                }
            }
        }