HomeworkSupermarket v2.cs

using System;
using System.Collections.Generic;

namespace HomeworkSupermarket
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Supermarket supermarket = new Supermarket();
            supermarket.Work();
        }
    }

    class Supermarket
    {
        private Queue<Client> _clients = new Queue<Client>();
        private List<Product> _products = new List<Product>();

        public Supermarket()
        {
            int productsCount = 10;
            int clientsCount = 10;

            for (int i = 0; i < productsCount; i++)
            {
                _products.Add(new Product());
            }

            for (int i = 0; i < clientsCount; i++)
            {
                _clients.Enqueue(new Client(_products));
            }
        }

        public int Money { get; private set; }

        public void Work()
        {
            while (_clients.Count > 0)
            {
                Console.WriteLine($"Balance: {Money}\nClients in queue: {_clients.Count}\n");

                Client currentClient = _clients.Dequeue();
                Money += currentClient.PayForBasket();

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

            Console.WriteLine($"All clients are left, you are earned {Money} money.");
            Console.ReadKey();
        }
    }

    class Product
    {
        public Product()
        {
            Price = Utils.GenerateRandomNumber(1, 250);
        }

        public int Price { get; private set; }
    }

    class Client
    {
        private List<Product> _basket = new List<Product>();
        private List<Product> _bag = new List<Product>();

        private static int _lastId;

        public Client(List<Product> productsInSupermarket)
        {
            int productsWant;
            int minProductsWant = 1;
            int maxProductsWant = 10;
            int minMoney = 20;
            int maxMoney = 2000;

            Id = ++_lastId;
            productsWant = Utils.GenerateRandomNumber(minProductsWant, maxProductsWant);
            Money = Utils.GenerateRandomNumber(minMoney, maxMoney);

            for (int i = 0; i < productsWant; i++)
            {
                _basket.Add(productsInSupermarket[Utils.GenerateRandomNumber(0, productsInSupermarket.Count - 1)]);
            }
        }

        public int Id { get; private set; }
        public int Money { get; private set; }

        public int PayForBasket()
        {
            while (_basket.Count > 0)
            {
                int bascketPrice = CalculateBascketPriceSum();

                if (bascketPrice <= Money)
                {
                    Money -= bascketPrice;

                    TransferFromBascketToBag();

                    Console.WriteLine($"Client № {Id} paid for his basket for {bascketPrice} money.");

                    return bascketPrice;
                }
                else
                {
                    DropProduct();
                }
            }

            Console.WriteLine($"Client № {Id} does not have enough money to paid for anything and just left empty.");
            return 0;
        }

        private int CalculateBascketPriceSum()
        {
            int bascketPrice=0;

            foreach (Product product in _basket)
            {
                bascketPrice += product.Price;
            }

            return bascketPrice;      
        }

        private void TransferFromBascketToBag()
        {
            foreach (Product product in _basket)
            {
                _bag.Add(product);
            }

            _basket.Clear();
        }

        private void DropProduct()
        {
            Console.WriteLine($"Client № {Id} does not have enough money to paid for his basket  " +
                                                  $"and he return 1 product to market.");

            _basket.RemoveAt(Utils.GenerateRandomNumber(0, _basket.Count - 1));
        }
    }

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

        public static int GenerateRandomNumber(int min, int max)
        {
            return s_random.Next(min, max + 1);
        }
    }
}