using System;
using System.Data;
using System.Data.OleDb;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string connetionString = null;
            OleDbConnection connection ;
            OleDbDataAdapter oledbAdapter = new OleDbDataAdapter();
            string sql = null;
            connetionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Your mdb filename;";
            connection = new OleDbConnection(connetionString);
            sql = "insert into user values('user1','password1')";
            try
            {
                connection.Open();
                oledbAdapter.InsertCommand = new OleDbCommand(sql, connection);
                oledbAdapter.InsertCommand.ExecuteNonQuery();
                MessageBox.Show ("Row(s) Inserted !! ");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}