using System;

using System.Collections.Generic;

using System.IO;

using CsvHelper;

using CsvHelper.Configuration;

​

public class MyCsvClassMap : ClassMap<MyCsvClass>

{

    public MyCsvClassMap()

    {

        AutoMap();

        Map(m => m.DbId).Ignore();

    }

}

​

public class MyCsvClass

{

    public string DbId { get; set; }

    public string Data1 { get; set; }

    public string Data2 { get; set; }      

 }   

​

public class Program

{

    public static void Main(string[] args)

    {

        var o1 =    new  { DbId = "1", Data1="One", Data2="Two" };

        var o2 =    new  { DbId = "2", Data1="Hello", Data2="World" };

        var o3 =    new  { DbId = "3", Data1="foo", Data2="bar" };

        var list = new[] { o1, o2, o3 };

        using (var sw = new StringWriter())

        {

            using (var csvWriter = new CsvHelper.CsvWriter(sw))

            {

                csvWriter.Configuration.RegisterClassMap<MyCsvClassMap>();

                csvWriter.WriteHeader<MyCsvClass>();

                csvWriter.NextRecord();

                csvWriter.WriteRecords(list);

             }

            Console.WriteLine(sw.ToString());

         }      

    }

}