using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public class LineItem

    {

        public string Info {get;set;}

        public int Quantity {get;set;}

    }

    public static void Main()

    {

        var list = new List<LineItem>{

        new LineItem { Info = "two of these", Quantity = 2 },

        new LineItem { Info = "one of these", Quantity = 1 }

    };

        var list2 = list.SelectMany(x => Enumerable.Repeat(x, x.Quantity));

        foreach(var item in list2)

        {

            Console.WriteLine(item.Info + item.Quantity);

        }

        Console.WriteLine("Hello World");

    }

}