快速找出被選中radioButton(會linQ就很簡單，別在foreach了)

2011-04-26

1. [畫面上簡單丟3個radioButton、1個Button(Selected RadioButton)]

2.為”Selected RadioButton”，寫上

   1:   RadioButton selectedRadio = this.Controls.OfType<RadioButton>().Where(q => q.Checked == true).First<RadioButton>();

   2:   if (selectedRadio != null)

   3:       MessageBox.Show(selectedRadio.Text);