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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);