using System;

using System.Collections;

using System.Collections.Generic;

using System.Threading;

using System.Diagnostics;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var stopwatch = new Stopwatch();

        stopwatch.Start();

        var people = GetPeople();

        foreach (var person in people) {

            Console.WriteLine(person.FullName);

            break;

        }

        stopwatch.Stop();

        Console.WriteLine($"The operation took {stopwatch.ElapsedMilliseconds}ms");

    }

    private static IEnumerable<Person> GetPeople()

    {

        Thread.Sleep(100); //Simulo un costo prestazionale nel produrre le Person

        yield return new Person { FullName = "Shepherd", Age = 24 };

        Thread.Sleep(100);

        yield return new Person { FullName = "Samsara", Age = 32 };

        Thread.Sleep(100);

        yield return new Person { FullName = "Talos", Age = 11 };

    }

    private class Person {

        public string FullName { get; set; }

        public int Age { get; set; }

    }

}