private void button_Send_Click(object sender, EventArgs e)
 {
     try
     {
         MyAppSession appSession = (MyAppSession)this.cboClients.SelectedItem;
         if (appSession == null)
         {
             ShowMessage("没有选中任何在线客户端!");
             return;
         }
         if (!appSession.Connected)
         {
             ShowMessage("目标客户端不在线!");
             return;
         }
         string msg  = string.Format("push {0}", this.textBox_msg.Text + Environment.NewLine); //一定要加上分隔符
         byte[] bMsg = System.Text.Encoding.UTF8.GetBytes(msg);                                //消息使用UTF-8编码
         //this.tcpServerEngine.GetSessionByID(appSession.SessionID).Send(new ArraySegment<byte>(bMsg, 0, bMsg.Length));
         appSession.Send(new ArraySegment <byte>(bMsg, 0, bMsg.Length));
     }
     catch (Exception ee)
     {
         ShowMessage(ee.Message);
     }
 }
        void tcpServerEngine_NewRequestReceived(MyAppSession session, global::SuperSocket.SocketBase.Protocol.StringRequestInfo requestInfo)
        {
            switch (requestInfo.Key)
            {
            case "echo":
                this.ShowMessage(session.RemoteEndPoint, requestInfo.Body);
                break;

            case "heartbeat":
                this.ShowMessage(session.RemoteEndPoint, requestInfo.Body);
                string msg  = string.Format("push {0}", requestInfo.Body + Environment.NewLine); //一定要加上分隔符
                byte[] bMsg = System.Text.Encoding.UTF8.GetBytes(msg);                           //消息使用UTF-8编码
                session.Send(new ArraySegment <byte>(bMsg, 0, bMsg.Length));
                break;

            default:
                this.ShowMessage(session.RemoteEndPoint, "未知的指令(error unknow command)");
                break;
            }
        }