HospitalAnarchy

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

namespace HospitalAnarchy
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Patient> patients = new List<Patient>
            {new Patient ("Black",21,"ZPPP"),
             new Patient ("Green",30,"Amnesia"),
             new Patient ("Grey",32,"ZPPP"),
             new Patient ("Brown",88,"Appendicitis"),
             new Patient ("Yellow",13,"Allergy"),
             new Patient ("Purple",24,"HIV"),
             new Patient ("Pink",69,"Cholera"),
             new Patient ("White",42,"Ebola"),
             new Patient ("Orange",18,"Corona"),
             new Patient ("Blue",27,"HIV"), };

            while (true)
            {
                Console.WriteLine("1 - Sort and show by name\n2 - Sort and show by age\n3 - Search by disease");
                int command = Convert.ToInt32(Console.ReadLine());
                switch (command)
                {
                    case 1:
                        Console.Clear();
                        var sortedByName = patients.OrderBy(patient => patient.Name);
                        foreach (var patient in sortedByName)
                        {
                            Console.WriteLine(patient.Name);
                        }
                        break;
                    case 2:
                        Console.Clear();
                        var sortedByAge = patients.OrderBy(patient => patient.Age);
                        foreach (var patient in sortedByAge)
                        {
                            Console.WriteLine(patient.Name);
                        }
                        break;
                    case 3:
                        Console.Clear();
                        Console.WriteLine("Type a disease:");
                        string selectedDisease = Console.ReadLine();
                        var searchResult = from Patient patient in patients
                                           where patient.Disease == selectedDisease
                                           select patient;
                        foreach (var patient in searchResult)
                        {
                            Console.WriteLine(patient.Name);
                        }

                        break;
                }
            }
        }

        class Patient
        {
            public string Name { get; private set; }
            public int Age { get; private set; }
            public string Disease { get; private set; }

            public Patient(string name, int age, string disease)
            {
                Name = name;
                Age = age;
                Disease = disease;
            }
        }
    }
}