DataTable Columns

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 WindowsFormsTest
{
    public partial class Form1 : Form
    {
        DataTable dt = new DataTable();
        public Form1()
        {
            InitializeComponent();

            dt.Columns.AddRange(
                 new DataColumn[]
                {
                    new DataColumn("Id", typeof(int)),
                    new DataColumn("Name", typeof(string))
                });
            dataGridView1.DataSource = dt;

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            dt.Rows.Add(1, "AAAA");
            dt.Rows.Add(2, "BBBB");
        }
    }
}