C#聊天程序

C#聊天程序(11)         Received,
        End,
        Error
    }

    // Nested enum for supported states
    public enum Status{
        Listening,
        Connected
    }

    // Start up the talker's functionality
    public void Start(){
        ThreadPool.QueueUserWorkItem(new WaitCallback(EstablishSocket));
    }

    // Send text to remote connection
    public void SendTalk(String newText){               
        String send;
        // Is this an append
        if((prevSendText.Length <= newText.Length) && String.CompareOrdinal(
            newText, 0, prevSendText, 0, prevSendText.Length)==0){
            String append = newText.Substring(prevSendText.Length);
            send = String.Format("A{0}:{1}", append.Length, append);
        // or a complete replacement
        }else{
            send = String.Format("R{0}:{1}", newText.Length, newText);
        }  
        // Send the data and flush it out
        writer.Write(send);
        writer.Flush();