BackgroundWorker后台线程

BackgroundWorker connectWork = new BackgroundWorker();
 public FormClient()
{
      connectWork.DoWork += new DoWorkEventHandler(connectWork_DoWork);
            connectWork.RunWorkerCompleted += new RunWorkerCompletedEventHandler(connectWork_RunWorkerCompleted);
}

 /// <summary>
        /// 异步方式与服务器进行连接
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void connectWork_DoWork(object sender, DoWorkEventArgs e)
        {
            client = new TcpClient();
            IAsyncResult result = client.BeginConnect(serverIP, 8889, null, null);
            while (!result.IsCompleted)
            {
                Thread.Sleep(100);
                AddStatus(".");
            }
            try
            {
                client.EndConnect(result);
                e.Result = "success";
            }
            catch (Exception ex)
            {
                e.Result = ex.Message;
                return;
            }
        }

        /// <summary>
        /// 异步方式与服务器完成连接操作后的处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void connectWork_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Result.ToString() == "success")
            {
                AddStatus("连接成功");
                //获取网络流
                NetworkStream networkStream = client.GetStream();
                //将网络流作为二进制读写对象
                br = new BinaryReader(networkStream);
                bw = new BinaryWriter(networkStream);
                AsyncSendMessage("Login," + txt_UserName.Text);
                Thread threadReceive = new Thread(new ThreadStart(ReceiveData));
                threadReceive.IsBackground = true;
                threadReceive.Start();
            }
            else
            {
                AddStatus("连接失败:" + e.Result);
                btn_Login.Enabled = true;
            }
        }


 private void btn_Login_Click(object sender, EventArgs e)
        {
                connectWork.RunWorkerAsync();
        }