private void bindingNavigatorSaveItem_Click(object sender, EventArgs e
{
  OleDbParameter p;
  // insert
  string strIns = "INSERT INTO tbl1(id, txt) VALUES (?, ?)";
  OleDbCommand insertCmd = new OleDbCommand(strIns, con);
  da.InsertCommand = insertCmd;
  p = new OleDbParameter("@id", OleDbType.Integer);
  p.SourceColumn = "id";
  p.SourceVersion = DataRowVersion.Original;
  insertCmd.Parameters.Add(p);
  p = new OleDbParameter("@txt", OleDbType.VarChar);
  p.SourceColumn = "txt";
  p.SourceVersion = DataRowVersion.Original;
  insertCmd.Parameters.Add(p);
 // update
  string strUpd = "UPDATE tbl1 SET id = ?, txt = ?";
   //string strUpd = "UPDATE tbl1 SET txt = ?";
  OleDbCommand updateCmd = new OleDbCommand(strUpd, con);
  da.UpdateCommand = updateCmd;
  p = new OleDbParameter("@id", OleDbType.Integer);
  p.SourceColumn = "id";
  p.SourceVersion = DataRowVersion.Original;
  updateCmd.Parameters.Add(p);
  p = new OleDbParameter("@txt", OleDbType.VarChar);
  p.SourceColumn = "txt";
  p.SourceVersion = DataRowVersion.Original;
  updateCmd.Parameters.Add(p);
  // delete
  string strDel = "DELETE FROM tbl1 WHERE id = ? AND txt = ?";
  OleDbCommand deleteCmd = new OleDbCommand(strDel, con);
  da.DeleteCommand = deleteCmd;
  p = new OleDbParameter("@id", OleDbType.Integer);
  p.SourceColumn = "id";
  p.SourceVersion = DataRowVersion.Original;
  deleteCmd.Parameters.Add(p);
  p = new OleDbParameter("@txt", OleDbType.VarChar);
  p.SourceColumn = "txt";
  p.SourceVersion = DataRowVersion.Original;
  deleteCmd.Parameters.Add(p);
  da.Update(ds.Tables[0]);
}