C#聊天程序

C#聊天程序(10)         writer = null;

        statusText = prevSendText = prevReceiveText = String.Empty;
    }

    // Finalize a talker
    ~Talker(){
        Dispose();
    }

    // Dispose of resources and surpress finalization
    public void Dispose(){       
        GC.SuppressFinalize(this);
        if(reader != null){
            reader.Close();
            reader = null;
        }
        if(writer != null){
            writer.Close();
            writer = null;
        }
        if(socket != null){
            socket.Close();
            socket = null;
        }       
    }

    // Nested delegat class and matchine event
    public delegate
       void NotificationCallback(Notification notify, Object data);
    public event NotificationCallback Notifications;

    // Nested enum for notifications
    public enum Notification{
        Initialized = 1,
        StatusChange,