C# 图形编程 for RadioButton group ,checked & find

1，radio buttons怎么分组？

将所有的radiobutton需要分成一组的放在一个容器中，如Panel或GroupBox中

2，判断RadioButton是否选中

 if (this.radioButtonInner.Checked == false && this.radioButtonOutter.Checked == false) {       this.btnDown.Enabled = false;        return flag;  }

3，找到整个容器中被选中的RadioButton

RadioButton GetCheckedRadio(Control container){    foreach (var control in container.Controls)    {        RadioButton radio = control as RadioButton;        if (radio != null && radio.Checked)        {            return radio;        }    }    return null;}