ДЗ Анархия в больнице

using System;
using System.Collections.Generic;
using System.Linq;

namespace CSLight
{
    internal class Program
    {
        static void Main(string[] args)
        {
            PersonBase person = new PersonBase();
            person.ShowPatientsInfo();
        }
    }

    class PersonBase
    {
        private List<Person> _patients;

        public PersonBase()
        {
            GeneratePatients();
        }

        public void ShowPatientsInfo()
        {
            const string CommandSortBySurname = "1";
            const string CommandSortByAge = "2";
            const string CommandFilterByDisease = "3";
            const string CommandExit = "exit";

            bool isRunnig = true;

            while (isRunnig)
            {
                Console.WriteLine("Введите команду:");

                string userInput = Console.ReadLine();

                switch (userInput)
                {
                    case CommandSortBySurname:
                        SortBySurname();
                        break;

                    case CommandSortByAge:
                        SortByAge();
                        break;

                    case CommandFilterByDisease:
                        FilterByDisease();
                        break;

                    case CommandExit:
                        isRunnig = false;
                        break;
                }
            }

            Console.ReadKey();
        }

        private void SortBySurname()
        {
            var sortedList = _patients.OrderBy(patient => patient.Surname);
            ShowList(sortedList);
        }

        private void SortByAge()
        {
            var sortedList = _patients.OrderBy(patient => patient.Age);
            ShowList(sortedList);
        }

        private void FilterByDisease()
        {
            Console.WriteLine("Какое заболевание вывести?");
            string disease = Console.ReadLine();
            Console.WriteLine($"Пациенты с {disease}");

            var filteredList = _patients.Where(patient => patient.Disiase == disease);

            ShowList(filteredList);
        }

        private void ShowList(IEnumerable<Person> list)
        {
            foreach (Person person in list)
            {
                Console.WriteLine($"{person.Surname} {person.Name} {person.Patronymic} - {person.Age} - {person.Disiase}");
            }
        }

        private void GeneratePatients()
        {
            PersonCreator creator = new PersonCreator();
            int dataBaseCapacity = 20;

            _patients = new List<Person>();

            for (int i = 0; i < dataBaseCapacity; i++)
            {
                _patients.Add(creator.CreatePerson());
            }
        }
    }

    class PersonCreator
    {
        private List<string> _names;
        private List<string> _surnames;
        private List<string> _patronymic;
        private List<string> _diseases;

        public PersonCreator()
        {
            InitNames();
            InitSurnames();
            InitPatronymics();
            InitDiseases();
        }

        public Person CreatePerson()
        {
            int maxAge = 100;
            int age = UserUtils.GenerateRandomValue(maxAge);

            string name = GetRandomValue(_names);
            string surname = GetRandomValue(_surnames);
            string patronymic = GetRandomValue(_patronymic);
            string crimeType = GetRandomValue(_diseases);

            return new Person(name, surname, patronymic, age, crimeType);
        }

        private void InitSurnames()
        {
            _surnames = new List<string>();
            _surnames.Add("Смирнов");
            _surnames.Add("Иванов");
            _surnames.Add("Кузнецов");
            _surnames.Add("Попов");
            _surnames.Add("Соколов");
            _surnames.Add("Лебедев");
            _surnames.Add("Козлов");
            _surnames.Add("Новиков");
            _surnames.Add("Морозов");
            _surnames.Add("Козлов");
            _surnames.Add("Волков");
        }

        private void InitPatronymics()
        {
            _patronymic = new List<string>();
            _patronymic.Add("Максимович");
            _patronymic.Add("Михаилович");
            _patronymic.Add("Александрович");
            _patronymic.Add("Дмитриевич");
            _patronymic.Add("Денисович");
            _patronymic.Add("Ильич");
            _patronymic.Add("Андреевич");
            _patronymic.Add("Артемович");
            _patronymic.Add("Иванович");
            _patronymic.Add("Алексеевич");
            _patronymic.Add("Никитич");
        }

        private void InitNames()
        {
            _names = new List<string>();
            _names.Add("Максим");
            _names.Add("Михаил");
            _names.Add("Александр");
            _names.Add("Дмитрий");
            _names.Add("Денис");
            _names.Add("Илья");
            _names.Add("Андрей");
            _names.Add("Артем");
            _names.Add("Иван");
            _names.Add("Алексей");
            _names.Add("Никита");
        }

        private void InitDiseases()
        {
            _diseases = new List<string>();
            _diseases.Add("Кашель");
            _diseases.Add("Температура");
            _diseases.Add("Сопли");
        }

        private string GetRandomValue(List<string> values)
        {
            int randomId = UserUtils.GenerateRandomValue(values.Count);
            return values[randomId];
        }
    }

    class Person
    {
        public Person(string name, string surname, string patronymic, int age, string disease)
        {
            Name = name;
            Surname = surname;
            Patronymic = patronymic;
            Disiase = disease;
            Age = age;
        }

        public string Name { get; private set; }

        public string Surname { get; private set; }

        public string Patronymic { get; private set; }

        public int Age { get; private set; }

        public string Disiase { get; private set; }
    }

    static class UserUtils
    {
        private static Random s_random = new Random();

        public static int GenerateRandomValue(int maxValue)
        {
            return s_random.Next(maxValue);
        }
    }
}