using System.Data.OleDb;

public partial class clienti : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        OleDbConnection connDB;
        string sql;
        OleDbCommand cmd; 
        OleDbDataReader aReader; 
        connDB = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; data source=./app_data/mydb.mdb");
        connDB.Open();
        sql = "SELECT * FROM clienti";
        cmd = new OleDbCommand(sql, connDB);
        aReader = cmd.ExecuteReader();
        try
        {
        while (aReader.Read()) 
        {
          Response.Write("Letto elemento:" + aReader[0] + "<br>");
        }
        }
        finally
        {
        aReader.Close();
        connDB.Close();
        } 

    }
....