socket异步接收，内存持续增大

本人本人封装了一个tcpclient类，采用异步接收的方式，测试时开1000个连接发数据，发现内存一直在增大。

        /// <summary>
        /// 连接，一般用于客户端的创建
        /// </summary>
        /// <param name="ServerIP">Socket连接的IP地址</param>
        /// <param name="Port">Socket连接的端口</param>
        public void Connect(string ip, int port)
        {
            ConnectByParams(ip, port, DEFAULT_BUFFER_SIZE, DEFAULT_BUFFER_SIZE);
        }
        private void ConnectByParams(string ip, int port, int sendBufferSize, int receiveBufferSize)
        {
            _connIp = ip;
            _connPort = port;
            try
            {
                _SendBufferSize = sendBufferSize;
                _ReceiveBufferSize = receiveBufferSize;
                _Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                _Socket.SendBufferSize = _SendBufferSize;
                _Socket.ReceiveBufferSize = _ReceiveBufferSize;
                _Socket.NoDelay = true;
                _ReceiveBuffer = new byte[_Socket.ReceiveBufferSize];
                _Socket.BeginConnect(ip, port, new AsyncCallback(ConnectCallBack), _Socket);
            }
            catch (Exception ex)
            {
                if (ExceptionEvent != null)
                    ExceptionEvent(this, new SocketEventArgs(null, "连接失败:" + ex.Message));
                this.Close();
            }
        }
        private void ConnectCallBack(IAsyncResult iar)
        {
            try
            {
                iar.AsyncWaitHandle.Close();
                if (!IsConnected)
                    throw new Exception("");
                if (SocketConnectedEvent != null)
                    SocketConnectedEvent(this, true);
                _Socket.BeginReceive(_ReceiveBuffer, 0, _ReceiveBuffer.Length, SocketFlags.None, acRcv, _Socket);
            }
            catch (Exception ex)
            {
                if (SocketConnectedEvent != null)
                    SocketConnectedEvent(this, false);
                if (ExceptionEvent != null)
                    ExceptionEvent(this, new SocketEventArgs(null, "连接失败:" + ex.Message));
                this.Close();
            }
        }
        /// <summary>
        /// 接收数据
        /// </summary>
        private void AsynRecvCallBack(IAsyncResult iar)
        {
            if (_Socket == null) return;	//防止其他线程关闭Socket;
            try
            {
                int nLen = _Socket.EndReceive(iar);
                iar.AsyncWaitHandle.Close();
                if (nLen <= 0)	//使用接收0字节作为远端Socket断开的判断
                {
                    if (SocketDisconnectedEvent != null)
                        SocketDisconnectedEvent(this, null);
                    this.Close();
                }
                else
                {
                    byte[] m_ByteDatas = new byte[nLen];
                    Array.Copy(_ReceiveBuffer, 0, m_ByteDatas, 0, nLen);
                    if (ReceivedEvent != null)
                        ReceivedEvent(this, new SocketEventArgs(m_ByteDatas, null));
                    //继续接收
                    _Socket.BeginReceive(_ReceiveBuffer, 0, _ReceiveBuffer.Length, SocketFlags.None, acRcv, null);
                }
            }
            catch (SocketException ex)
            {
                if (ExceptionEvent != null)
                    ExceptionEvent(this, new SocketEventArgs(null, "Type:" + ex.GetType().Name + ";ErrorCode:" + ex.ErrorCode.ToString() + ";Msg:" + ex.Message +
                        "\r\n" + ex.StackTrace));
                if (ex.ErrorCode != 10035)
                {
                    if (SocketDisconnectedEvent != null)
                        SocketDisconnectedEvent(this, null);
                    this.Close();
                }
            }
            catch (Exception ex)
            {
                if (ExceptionEvent != null)
                    ExceptionEvent(this, new SocketEventArgs(null, ex.GetType().Name + ":" + ex.Message + "\r\n" + ex.StackTrace));
            }
        }

查了很多地方都没发现哪里提到过异步接收会有这个问题，尝试增加iar.AsyncWaitHandle.Close();也无效；
把
byte[] m_ByteDatas = new byte[nLen];
Array.Copy(_ReceiveBuffer, 0, m_ByteDatas, 0, nLen);
if (ReceivedEvent != null)
ReceivedEvent(this, new SocketEventArgs(m_ByteDatas, null));
这一段注释掉也不行。
奇了怪了，哪位大牛碰到过相似的问题，求指导….