/// <summary>
        /// 소켓 연결 종료를 처리하는 콜백 함수
        /// </summary>
        /// <param name="ar"></param>
        private void OnCloseCallBack(IAsyncResult ar)
        {
            try
            {
                Socket client = (Socket)ar.AsyncState;

                client.EndDisconnect(ar);
                client.Close();

                AsyncSocketConnectionEventArgs cev = new AsyncSocketConnectionEventArgs(this.id);

                Closed(cev);
            }
            catch (System.Exception e)
            {
                AsyncSocketErrorEventArgs eev = new AsyncSocketErrorEventArgs(this.id, e);

                ErrorOccured(eev);
            }
        }