void Main()

{

    using (var stream = new MemoryStream())

    using (var writer = new StreamWriter(stream))

    using (var reader = new StreamReader(stream))

    using (var csv = new CsvWriter(writer))

    {

        var records = new List<Person>

        {

            new Test { DisplayName = "one", Age = 1},

            new Test { DisplayName = "two", Age = 2 },

        };

        csv.Configuration.RegisterClassMap<PersonMap>();

        csv.WriteRecords(records);

        writer.Flush();

        stream.Position = 0;

        Console.WriteLine(reader.ReadToEnd());

    }

}

​

public class Person

{

    public string DisplayName { get; set; }

    public int Age { get; set; }

}

​

public sealed class PersonMap : ClassMap<Person>

{

    public PersonMap()

    {

        Map(m => m.DisplayName).Name("Display Name");

        Map(m => m.Age);

    }

}

​

using CsvHelper;

using System.Collections.Generic;

using System.IO;

​

namespace Test

{

    class Program

    {

        class CsvColumns

        {

            private string column_01;

​

            [CsvHelper.Configuration.Attributes.Name("Column 01")] // changes header/column name Column_01 to Column 01

            public string Column_01 { get => column_01; set => column_01 = value; }

        }

​

        static void Main(string[] args)

        {

            List<CsvColumns> csvOutput = new List<CsvColumns>();

            CsvColumns rows = new CsvColumns();

            rows.Column_01 = "data1";

            csvOutput.Add(rows);

​

            string filename = "test.csv";

            using (StreamWriter writer = File.CreateText(filename))

            {

                CsvWriter csv = new CsvWriter(writer);

                csv.WriteRecords(csvOutput);

            }

        }

    }

}

​