[C#] ControlAddHandler

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ControlAddHandler
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            foreach (Control control in this.Controls)
            {
                if (control is RadioButton)
                {
                    ((RadioButton)control).CheckedChanged += radioButton_CheckedChanged;
                }
            }
        }

        private void radioButton_CheckedChanged(object sender, EventArgs e)
        {
            switch (int.Parse(((RadioButton)sender).Name.Replace("radioButton", string.Empty)))
            {
                case 1:
                case 2:
                case 6:
                case 7:
                case 9:
                case 11:
                case 12:
                    comboBox1.Enabled = true; break;
                default:
                    comboBox1.Enabled = false; break;
            }
        }
    }
}