datagridview同步更新数据库如何实现？

string sql2 = "select * from b1";

            string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;Data Source="

                   + Application.StartupPath

                   + "\\db1.MDB";

            OleDbConnection conn = new OleDbConnection(strConnection);

            

            OleDbDataAdapter adp = new OleDbDataAdapter(sql2,conn);

            OleDbCommandBuilder ocb = new OleDbCommandBuilder(adp);

            DataTable dt = new DataTable();

            //DataSet ds = new DataSet();

            BindingSource bs = new BindingSource();

            conn.Open();

            adp.Fill(dt);

            this.dataGridView1.DataSource = dt;

            bs.DataSource = dt;

            conn.Close();

            adp.Update((DataTable)bs.DataSource);