private void UpdateLabel()
       {
           label1.Text = "나는 ";
           Control.ControlCollection controls = this.Controls;
           foreach (Control control in controls)
           {
               Type t = control.GetType();
               if (t.FullName.Equals("System.Windows.Forms.CheckBox"))
               {
                   CheckBox c = (CheckBox)control;
                   if (c.Checked)
                   {
                       label1.Text += c.Text+" ";
                   }
               }
           }
           label1.Text += "를 먹겠다";
       }