ดึงข้อมูลจากฐานข้อมูล 2 คอลัมน์ใส่ ComboBox มีวิธีทำไหมครับ

private void Customer_Load(object sender, EventArgs e)
        {
            OleDbConnection objConn;
            OleDbDataAdapter dtAdapter;
            DataTable dt = new DataTable();

            String strConnString;
            strConnString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=SparesStore.mdb;";
            objConn = new OleDbConnection(strConnString);
            objConn.Open();

            String strOleDb;
            strOleDb = "SELECT * FROM Customer";

            dtAdapter = new OleDbDataAdapter(strOleDb, objConn);
            dtAdapter.Fill(dt);

            dtAdapter = null;
            objConn.Close();
            objConn = null;
            this.comboBox1.DataSource = dt;
            this.comboBox1.DisplayMember = "รหัสลูกค้า";
        }