❔ How to display All the integers in a list concatenated with a string

using System.Linq;
using System.Collections.Generic;
namespace BlackJack_Game
{
    internal class Program
    {
        private static List<int> cards = new List<int>
    {
        11,2,3,4,5,6,7,8,9,10,10,10,10
    };

        private static List<int> userCards = new List<int>
        {

        };

        private static List<int> computerCards = new List<int>
        {

        };

        static Random rnd = new Random(); //Create an instance of Random class somewhere. Note that it's pretty important not to create a new instance each time you need a random number.
                                          //You should reuse the old instance to achieve uniformity in the generated numbers. You can have a static field somewhere (be careful about thread safety issues):
                                          //This static field allows all static methods to use this random object as a field 

        static void Main(string[] args)
        {

            userStartingCards();
            

        static void userStartingCards()
        {
            for(int i = 0; i < 2; i++)
            {
                int randomStartingNumberUser = rnd.Next(cards.Count);
                userCards.Add(cards[randomStartingNumberUser]);
            }
            Console.WriteLine("Your cards are [{0}, {1}], current score {2}", userCards[0], userCards[1], userCards.Sum());
        }