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Reference data in SqlDataReader by column name

using System;     using System.Data.SqlClient;   class pubsdemo   {     static void Main(string[] args)     {       String sConn = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";         String sSQL = "select id, firstname, lastname from Employee";       SqlConnection oConn = new SqlConnection(sConn);       oConn.Open();       SqlCommand oCmd = new SqlCommand(sSQL, oConn);       SqlDataReader oReader = oCmd.ExecuteReader();       while(oReader.Read()) {         Console.WriteLine("{0} {1} {2}",           oReader["id"],           oReader["firstname"],           oReader["lastname"]);       }     }   }