SqlDataReader使用序数索引器

Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            SqlConnection conn = new SqlConnection("server=zhuobin;uid=sa;pwd=zhuobin;database=northwind");
            string sql = @"select companyname,contactname from customers where contactname like 'M%'";
            try
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand(sql,conn);
                SqlDataReader reader = cmd.ExecuteReader();
               
                Console.WriteLine("\t{0}{1}","CompanyName".PadRight(25),"ContactName".PadRight(20));
                Console.WriteLine("\t{0}{1}","===========".PadRight(25),"===========".PadRight(20));
                while (reader.Read())
                {
                    Console.WriteLine("\t{0}|{1}",reader[0].ToString().PadRight(25),reader[1].ToString().PadRight(20));
                }
            }
            catch (SqlException ex)
            {
                Console.WriteLine("Error:{0}", ex.Message);
            }
            finally
            {

            } Console.ReadLine();
        }
    }
}