System Data Oledb C# by API

using System;
using System.Data;
using System.Data.OleDb;
class MainClass
{
  static void Main(string[] args)
  {
        string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=c:\Northwind.mdb";
        string SQL = "SELECT * FROM Orders";
        OleDbConnection conn = new OleDbConnection(ConnectionString);       
        OleDbCommand cmd = new OleDbCommand(SQL);
        cmd.Connection = conn;
        conn.Open();
        OleDbDataReader reader = cmd.ExecuteReader();
        try 
        {
            while (reader.Read()) 
            {
                Console.Write("OrderID:"+reader.GetInt32(0).ToString() );
                Console.Write(" ,");
                Console.WriteLine("Customer:" + reader.GetString(1).ToString() );
            }
        }
        finally 
        {
            reader.Close();
            conn.Close();
        }   
  }
}