using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var items = new List<Item> ();

        var people = new List<Person> ();

        var countries = new List<Country> ();

        var continents = new List<Continent> ();

        var brands = new List<Brand> ();        

        var itemsOwner = 

            items

            .Join (people, src => src.OwnerId, p => p.PersonId, (src, p) => new JoinHelper { Item = src, Person = p  } )

            .Join (brands, src => src.Item.BrandId, b => b.BrandId, (src, b) => new JoinHelper { Item = src.Item, Person = src.Person, Brand = b })

            .Join (countries, src => src.Person.CountryId, c => c.CountryId, (src, c) => new JoinHelper { Item = src.Item, Person = src.Person, Brand = src.Brand, Country = c } )

            .Select (x => new { x.Item.ItemName, x.Person.PersonName, x.Brand.BrandName, x.Country.CountryName });

    }

}

​

​

    class JoinHelper

    {

        public Item Item { get; set; }

        public Brand Brand { get; set; }

        public Person Person { get; set; }      

        public Country Country { get; set; }        

        public Continent Continent { get; set; }        

    }

​

​

    class Item

    {

        public string ItemName { get; set; }

        public int OwnerId { get; set; }

        public int BrandId { get; set; }

    }

​

    class Brand

    {

        public int BrandId { get; set; }

        public string BrandName { get; set; }

    }

​

    class Person

    {

        public int PersonId { get; set; }

        public string PersonName { get; set; }

​

        public int CountryId { get; set; }

    }

​

    class Country

    {

        public int CountryId { get; set; }

        public int CountryName { get; set; }

​

        public int ContinentId { get; set; }

    }

​

    class Continent

    {

        public int ContinentId { get; set; }

        public int ContinentName { get; set; }

    }

​