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 csvOutput = new List();
            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);
            }
        }
    }
}