LINQ-5

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

namespace Hoomework5
{
    class Program
    {
        static void Main(string[] args)
        {
            List<StewCan> stewCans = new List<StewCan> { };

            for (int i = 0; i < 10; i++)
            {
                stewCans.Add(new StewCan());
            }

            Console.WriteLine("--Все Банки--");
            foreach (var stewCan in stewCans)
            {
                stewCan.ShowInfo();
                stewCan.Expire();
            }

            var filteredStewCans = stewCans.Where(stewCan => stewCan.IsExpired == true);

            Console.WriteLine("--Просроченные Банки--");
            foreach (var stewCan in filteredStewCans)
            {
                stewCan.ShowInfo();
            }
        }
    }

    class StewCan
    {
        private string _name;
        private int _shelfLife;
        private int _ageOfManufacture;
        private readonly int _thisYear = 2021;
        private static Random _random = new Random();

        public bool IsExpired { get; private set; }

        public StewCan(string name = "simple stew can")
        {
            _name = name;
            _ageOfManufacture = _random.Next(1965, 2001);
            _shelfLife = _random.Next(21, 60);
        }

        public bool Expire()
        {
            IsExpired = _thisYear > (_ageOfManufacture + _shelfLife);
            return IsExpired;
        }

        public void ShowInfo()
        {
            Console.WriteLine($"Эта тушенка годится до {_ageOfManufacture + _shelfLife} года, а сейчас {_thisYear}.");
        }
    }
}