using System.Collections.Generic;
using Shop.Model;

namespace Shop
{
    class Shop
    {
        public string Name { get; set; }
        public string WorkTime { get; set; }
        List<Buyer> Buyers { get; set; } = new List<Buyer>();
        List<CatalogItem> CatalogItems { get; set; } = new List<CatalogItem>();
    }
}

namespace Shop.Model
{
    class CatalogItem
    {
        public string Title { get; set; }
        public string Model { get; set; }
        public float Cost { get; set; }
        public int Count { get; set; }
    }
}

using System;
using System.Collections.Generic;

namespace Shop.Model
{
    class Order
    {
        public List<CatalogItem> CatalogItems { get; set; } = new List<CatalogItem>();
        public Buyer Buyer { get; set; } = new Buyer();
        public DateTime DateOfSale { get; set; }
        public bool Paid { get; set; }
    }
}

namespace Shop.Model
{
    class Buyer
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string PhoneNumber { get; set; }
        public bool BlackList { get; set; }
    }
}