how connect to access database by c#

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

private void Form1_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'database21DataSet.Table1' table. You can move, or remove it, as needed.
this.table1TableAdapter1.Fill(this.database21DataSet.Table1);
// TODO: This line of code loads data into the 'database21DataSet1.Table1' table. You can move, or remove it, as needed.
this.table1TableAdapter.Fill(this.database21DataSet1.Table1);


}

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{

}

private void groupBox1_Enter(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)
{
this.table1TableAdapter.Update(database21DataSet1);
MessageBox.Show("Updated ,,,successfully");
}

private void button2_Click(object sender, EventArgs e)
{





}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{

}
}
}