using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        static void Print<T>(IEnumerable<T> items) => Console.WriteLine($"[{string.Join(",", items)}]");

        var foo = new Foo{ Names = {23, 42} };

        Print(foo.Names);

        var bar = new Foo{ Names = new List<int>{23, 42} };

        Print(bar.Names);

    }

​

    class Foo

    {

        public List<int> Names { get; set; } = new List<int>{100};

    }

}