Form1.cs

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

namespace WindowsApplication1 {
    public partial class Form1 : Form {
        private DataTable CreateTable(int RowCount) {
            DataTable tbl = new DataTable();
            tbl.Columns.Add("Name", typeof(string));
            tbl.Columns.Add("ID", typeof(int));
            tbl.Columns.Add("Number", typeof(int));
            tbl.Columns.Add("Date", typeof(DateTime));
            for(int i = 0; i < RowCount; i++)
                tbl.Rows.Add(new object[] { String.Format("Name{0}", i), i, 3 - i, DateTime.Now.AddDays(i) });
            return tbl;
        }

        private GridRadioGroupColumnHelper _Helper;
        public Form1() {
            InitializeComponent();
            gridControl1.DataSource = CreateTable(20);
            _Helper = new GridRadioGroupColumnHelper(gridView1);
            _Helper.SelectedRowChanged += _Helper_SelectedRowChanged;

        }

        void _Helper_SelectedRowChanged(object sender, EventArgs e) {
            Text = _Helper.SelectedDataSourceRowIndex.ToString();
        }
        protected override void OnFormClosing(FormClosingEventArgs e) {
            base.OnFormClosing(e);
            _Helper.SelectedRowChanged -= _Helper_SelectedRowChanged;
            _Helper.Disable();
            _Helper = null;
        }
    }
}