using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var betterList = new List<DataRowThing>();

        betterList.Add(new("firstcol", "secondcol"));

        foreach (var row in betterList)

        {

            Console.WriteLine($"{row.col1}, {row.col2}");

        }

    }

}

​

public record DataRowThing(string col1, string col2);