TcpClient在form2里发送给服务器请求时遇到问题

有一个客户端的FORM，一个登陆按钮的click事件：  
private void button4_Click(object sender, EventArgs e)  
{  
    sendmsg = "#submit#username#" + textBox4.Text + "#password#" + textBox3.Text + "#";  
    _netcnn = new Thread(new ThreadStart(chkusr));  
    _netcnn.Start();  
    chkflag = 0;
             while (chkflag==0)
            {
                continue;
            }
            _netcnn.Interrupt();
            if (chkflag==1)
            {
                Form2 f2 = new Form2();
                f2.f1 = this;
                f2.Show();
                this.Visible=false;
            }
            if (chkflag == 2)
            {
                MessageBox.Show("登陆失败，请检查用户名、密码！");
            }
}  
chkusr方法的代码：  
private void chkusr()  
{  
    Ccs = new Connectclass();  
    Boolean flag1 = Ccs.connect();  
    if (flag1 == false)  
    {  
        MessageBox.Show("连接服务器失败，请检查网络连接");  
        chkflag = 3;  
        return;  
    }  
    bool returnflag;  
    returnflag= Ccs.CheckUser(sendmsg);  
    if (returnflag == true)  
    {  
        chkflag = 1;  
    }  
    else  
    {  
        chkflag = 2;  
    }  
}  
这里的  
Ccs.connect()方法是：  
        public Boolean connect()  
        {  
            try  
            {  
                myclient = new TcpClient("192.168.1.3", 1234);  
                myclient.ReceiveTimeout = 100;  
                networkStream=myclient.GetStream();  
                  
                streamReader = new StreamReader(networkStream);  
                streamWriter = new StreamWriter(networkStream);  
            }  
            catch  
            {  
                return false;  
            }  
            return true;  
        }  

form2的load事件
private void Form2_Load(object sender, EventArgs e)
        {
            string initialization = f1.Ccs.Sendcommand("#initialization#");
            //string initialization = f1.turnmsg;
            if (initialization == "false")
            {
                MessageBox.Show("Server disconnected");
            }
            else
            {
            ……
              }
         }

这里的Sendcommand事件代码是：
public string Sendcommand(string Command)
        {
            try
            {                 
                string msg=Command;
                streamWriter.WriteLine(msg);
                  streamWriter.Flush();
            }
            catch (Exception ee)
            {
                return "false";
            }
            string reseavemsg="";
            try
             {
                bool flag=true;
                 while (flag)
                {
                    reseavemsg = streamReader.ReadLine();
                    if (reseavemsg != "")
                    {
                        flag = false;
                    }
                }
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.ToString());
                return "false";
            }
            return reseavemsg;
        }

现在的问题是，在form1里面是可以通过认证的，然后启动form2，在form2的load事件里需要一个Sendcommand事件，来请求服务端发送初始化信息，但是现在Sendcommand发送的#initialization#信息服务端根本就收不到，单步执行到streamread时，就出Exception了，不知道是不是因为在form1里面启动过连接的新线程，在线程中断以后需要重新连接，还是什么回事，大家帮帮忙啦～谢谢谢谢

 后来测试发现在Sendcommand事件里面重新调用connect()方法的话是可以连接成功，这样也就是说是重新连接了，并且能收到服务端的回复，但是在服务端看是另外一个新的连接了，而不是之前在验证用户登陆时候的那个连接。