索引groupBox中的RadioButton到配置文件中，初始化自动索引——c#

如下代码，我在关闭窗体是把RadioButton的当前索引值存到ini文件中

 　　　　　　 ridioButtonIndex = 0;
            foreach (Control con in groupBoxClear.Controls)
            {
                if (con is RadioButton)
                {
                    if ((con as RadioButton).Checked)
                    {
                        break;
                    }
                    ridioButtonIndex++;
                }
            }
            Ini.IniWriteValue("清除文件", "day", ridioButtonIndex.ToString());

然后在窗体初始化时再读出来并解析索引

//读取保存天数索引
            string deleteDay = Ini.IniReadValue("清除文件", "day");
            switch (deleteDay)
            {
                case "4":
                    radioButtonNot.Select();
                    break;
                case "3":
                    radioButtonDay3.Select();
                    break;
                case "2":
                    radioButtonDay7.Select();
                    break;
                case "1":
                    radioButtonDay15.Select();
                    break;
                case "0":
                    radioButtonDay30.Select();
                    break;
                default:
                    break;
            }

窗体如下