C#聊天程序

C#聊天程序(9)         default:
            Close();
            break;
        }
    }

    // Handle text change notifications and send talk
    private void HandleTextChange(Object sender, EventArgs e){
        if(talker != null){
            talker.SendTalk((sender as TextBox).Text);
        }       
    }  

    // Close with an eXPlanation
    private void Close(String message){  
        MessageBox.Show(message, "Error!");       
        Close();
    }

    // Private UI elements
    private TextBox receiveText;       
    private TextBox sendText;   
    private Label statusText;
    private Talker talker;  
}

// An encapsulation of the Sockets class used for socket chatting
class Talker:IDisposable{
    // ConstrUCt a talker
    public Talker(IPEndPoint endPoint, bool client){
        this.endPoint = endPoint;
        this.client = client;

        socket = null;
        reader = null;