Home work - data base players

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Home_Work
{
    class Program
    {
        static void Main(string[] args)
        {
            Database database = new Database();
            bool isWorking = true;
            string userInput;

            while (isWorking)
            {
                ShowMenu();
                userInput = Console.ReadLine();

                switch (userInput)
                {
                    case "1":
                        database.AddPlayer();
                        break;

                    case "2":
                        database.ShowAllPlayers();
                        break;

                    case "3":
                        database.BanPlayer();
                        break;

                    case "4":
                        database.UnbanPlayer();
                        break;

                    case "5":
                        database.DeletePlayer();
                        break;

                    default:
                        Console.WriteLine("Такой команды нет.");
                        break;
                }

                Console.ReadKey();
                Console.Clear();
            }
        }

        static void ShowMenu()
        {
            Console.WriteLine("1. Добавить игрока.\n" +
                "2. Вывести всех игроков.\n" +
                "3. Забанить игрока.\n" +
                "4. Разбанить игрока. \n" +
                "5. Удалить игрока.\n" +
                "6. Выход.\n");
            Console.Write("Введите номер команды: ");
        }
    }

    class Database
    {
        private List<Player> _players;

        public Database()
        {
            _players = new List<Player>();
        }

        public void AddPlayer()
        {
            string nickname = "Player";

            Console.Write("Введите никнейм: ");
            nickname = Console.ReadLine();

            _players.Add(new Player(nickname));
        }

        public void ShowAllPlayers()
        {
            foreach (Player player in _players)
            {
                player.ShowInfo();
            }
        }

        public void BanPlayer()
        {
            if(TryFindPlayer(out Player player))
            {
                player.Ban();
            }
        }

        public void UnbanPlayer()
        {
            if (TryFindPlayer(out Player player))
            {
                player.Ban();
            }
        }

        public void DeletePlayer()
        {
            if (TryFindPlayer(out Player player))
            {
                _players.Remove(player);
            }
        }

        private bool TryFindPlayer(out Player foundPlayer)
        {
            int number = GetNumber();

            foreach (Player player in _players)
            {
                if (player.Id == number)
                {
                    foundPlayer = player;
                    return true;
                }
            }

            Console.WriteLine("Игрок с таким ID отсутствует.");
            foundPlayer = null;
            return false;
        }

        private int GetNumber()
        {
            bool isConvert = false;
            int number = 0;

            string userInput;

            while (isConvert == false)
            {
                Console.Write("Введите ID: ");
                userInput = Console.ReadLine();

                isConvert = Int32.TryParse(userInput, out number);
            }

            return number;
        }
    }

    class Player
    {
        private static int Ids;

        private int _id;
        private string _nickname;
        private int _level;
        private bool _isBanned;

        static Player()
        {
            Ids = 1;
        }

        public Player(string nickname)
        {
            _id = Ids++;
            AssignNonStandardNickname(nickname);
            _level = 1;
            _isBanned = false;
        }

        public int Id => _id;

        public void ShowInfo()
        {
            Console.Write($"{_id}. Ник: {_nickname}. Уровень: {_level}. ");

            if (_isBanned)
                Console.Write("Забанен.");

            Console.WriteLine();
        }

        public void Ban()
        {
            _isBanned = true;
        }

        public void UnBan()
        {
            _isBanned = false;
        }

        private void AssignNonStandardNickname(string nickname)
        {
            if (nickname == "Player")
            {
                nickname += "_" + _id;
            }

            _nickname = nickname;
        }
    }
}