System Data Sqlclient C# by API

using System;
using System.Data;
using System.Data.SqlClient;
class UsingColumnOrdinals
{
  public static void Main()
  {
    SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.CommandText = "SELECT TOP 5 ID, FirstName, LastName FROM employee " +
      "ORDER BY ID";
    mySqlConnection.Open();
    SqlDataReader productsSqlDataReader = mySqlCommand.ExecuteReader();
    int idPos = productsSqlDataReader.GetOrdinal("ID");
    int firstNamePos = productsSqlDataReader.GetOrdinal("LastName");
    int lastNamePos = productsSqlDataReader.GetOrdinal("FirstName");
    while (productsSqlDataReader.Read())
    {
      Console.WriteLine("ID = " + productsSqlDataReader[idPos]);
      Console.WriteLine("FirstName = " + productsSqlDataReader[firstNamePos]);
      Console.WriteLine("LastName = " + productsSqlDataReader[lastNamePos]);
    }
    productsSqlDataReader.Close();
    mySqlConnection.Close();
  }
}