C# ดึงข้อมูลจาก sql โชว์ใน Dropdownlist คับผมรบกวนหน่อยคับ

		OleDbConnection objConn;
		OleDbDataAdapter dtAdapter;
		DataTable dt = new DataTable();
			  
	   String strConnString;
	   strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+
	   Server.MapPath("database/mydatabase.mdb")+"";
	   objConn = new OleDbConnection(strConnString);
	   objConn.Open();

		String strSQL;	
		strSQL = "SELECT * FROM country";

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

		dtAdapter = null;
		objConn.Close();
		objConn = null;

		//*** DropDownList ***//
		this.myDDL1.DataSource = dt;
		this.myDDL1.DataTextField = "CountryName";
		this.myDDL1.DataValueField = "CountryCode";
		this.myDDL1.DataBind();		
		
		//*** Default Value ***//
		myDDL1.SelectedIndex = myDDL1.Items.IndexOf(myDDL1.Items.FindByValue("TH"));  //*** By DataValueField ***//
		//myDDL1.SelectedIndex = myDDL1.Items.IndexOf(myDDL1.Items.FindByText("Thailand"));  //*** By DataTextField ***//