public MainForm()
        {
            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();
            
            //
            // TODO: Add constructor code after the InitializeComponent() call.
            //
            int idx = 0;
            foreach(Control c in groupBox1.Controls)
            {
                if(c is RadioButton)
                {
                    ((RadioButton)c).Text  = ((星期)idx).ToString();
                    ((RadioButton)c).Tag = ((星期)idx);
                    idx++;
                }
            }
        }

//csharp/6143