C#

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

namespace WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        OleDbConnection con = new OleDbConnection("provider=microsoft.jet.oledb.4.0;data source=d:\\LO2.mdb");
        OleDbDataAdapter ad;

        DataTable table = new DataTable();
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ad = new OleDbDataAdapter("select * from attributes ", con);
            OleDbCommandBuilder cb = new OleDbCommandBuilder(ad);
            ad.Fill(table);

            dataGridView1.DataSource = table;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // insert
            DataRow row = table.NewRow();
            row["identifier"] = textBox1.Text;
            row["language"] = textBox2.Text;
            row["title"] = textBox3.Text;
            row["description"] = textBox4.Text;
            row["id"] = textBox5.Text;
            table.Rows.Add(row);

            ad.Update(table); // error it's here

            dataGridView1.DataSource = table;
        }