Home work - top 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()
        {
            Database database = new Database();
            database.Work();
        }
    }

    class Database
    {
        private List<Player> _players;
        private int countTopPlayers;

        public Database()
        {
            _players = new List<Player>();
            Fill();
            countTopPlayers = 3;
        }

        public void Work()
        {
            bool isWorking = true;
            List<Player> players = _players;
            int number;

            while(isWorking == true)
            {
                Console.WriteLine("Игроки: ");
                ShowSelection(players);
                Console.WriteLine("\n1. Вывести топ по уровню.\n2. Вывести топ по силе.\n3. Вывести всех.\n4. Выход.");
                Console.Write("Введите команду: ");
                number = GetNumber();

                switch (number)
                {
                    case 1:
                        players = TakeTopByLevel();
                        break;

                    case 2:
                        players = TakeTopByPower();
                        break;

                    case 3:
                        players = _players;
                        break;

                    case 4:
                        isWorking = false;
                        break;

                    default:
                        Console.WriteLine("Неверная команда.");
                        break;
                }

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

        private int GetNumber()
        {
            bool isConverted = false;
            int number = 0;
            string userInput;

            while (isConverted == false)
            {
                userInput = Console.ReadLine();
                isConverted = Int32.TryParse(userInput, out number);
            }

            return number;
        }

        private List<Player> TakeTopByLevel()
        {
            var sortedPlayers = _players.OrderByDescending(player => player.Level).Take(countTopPlayers).ToList();

            return sortedPlayers;
        }

        private List<Player> TakeTopByPower()
        {
            var sortedPlayers = _players.OrderByDescending(player => player.Power).Take(countTopPlayers).ToList();

            return sortedPlayers;
        }

        private void ShowSelection(List<Player> players)
        {
            foreach (Player player in players)
            {
                player.ShowInfo();
            }
        }

        private void Fill()
        {
            _players.Add(new Player("Черёмушко Алексей Алексеевич"));
            _players.Add(new Player("Чер Дмитрий Алексеевич"));
            _players.Add(new Player("Альанах Алексей Дмитриевич"));
            _players.Add(new Player("Вассерман Анатолий Акашанович"));
            _players.Add(new Player("Шерлок Ди Холмс"));
            _players.Add(new Player("Макуночи Но Ипо"));
            _players.Add(new Player("Грозный Иван Васильевич"));
            _players.Add(new Player("Борн Дмитрий Анатольевич"));
            _players.Add(new Player("Навальный Владимир Владиславович"));
            _players.Add(new Player("Евпатий Калодратий"));
            _players.Add(new Player("Никто"));
            _players.Add(new Player("Андерсон Джон Викторович"));
            _players.Add(new Player("Самураев Душнила Тёмович"));
        }
    }

    class Player
    {
        private static Random _random;
        private string _fullName;
        private int _power;
        private int _level;

        static Player()
        {
            _random = new Random();
        }

        public Player(string fullName)
        {
            int maxValue= 100;

            _fullName = fullName;
            _level = _random.Next(maxValue); ;
            _power = _random.Next(maxValue);
        }

        public int Power => _power;
        public int Level => _level;

        public void ShowInfo()
        {
            Console.WriteLine($"{_fullName}. Сила: {_power}. Уровень: {_level}.");
        }
    }
}