using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var people = new[]

        {

            new Person() {Name = "Vasya", Surname = "Pupkin" },

            new Person() {Name = "Kostya", Surname = "Vasichkin" },

            new Person() {Name = "Simon", Surname = "Pupkin" }

        };

        var dishes = new[]

        {

            new Dish() {Name = "Gaspacho" },

            new Dish() {Name = "Burger" },

            new Dish() {Name = "Napoleon" }

        };

        var wellProvidedPeople = GiveDishesBadWay(people, dishes);

        foreach (var personWithDish in wellProvidedPeople)

        {

            Console.WriteLine("{0}:{1}", personWithDish.PersonName, personWithDish.DishName);

        }

        wellProvidedPeople = GiveDishesBetterWay(people, dishes);

        foreach (var personWithDish in wellProvidedPeople)

        {

            Console.WriteLine("{0}:{1}", personWithDish.PersonName, personWithDish.DishName);

        }

        wellProvidedPeople = GiveDishesBestWay(people, dishes);

        foreach (var personWithDish in wellProvidedPeople)

        {

            Console.WriteLine("{0}:{1}", personWithDish.PersonName, personWithDish.DishName);

        }

    }

    public static IEnumerable<PersonWithDish> GiveDishesBadWay(IEnumerable<Person> people, IEnumerable<Dish> dishes)

    {

        for (int i = 0; i < people.Count(); i++)

        {

            yield return new PersonWithDish()

            {

                PersonName = people.ElementAt(i).Name,

                DishName = dishes.ElementAt(i).Name

            };

        }

    }

    public static IEnumerable<PersonWithDish> GiveDishesBetterWay(IReadOnlyList<Person> people, IReadOnlyList<Dish> dishes)

    {

        for (int i = 0; i < people.Count; i++)

        {

            yield return new PersonWithDish()

            {

                PersonName = people[i].Name,

                DishName = dishes[i].Name

            };

        }

    }

    public static IEnumerable<PersonWithDish> GiveDishesBestWay(IEnumerable<Person> people, IEnumerable<Dish> dishes)

    {

        return people.Zip(dishes, (p, d) => new PersonWithDish

                          {

                              PersonName = p.Name,

                              DishName = d.Name

                          });

    }

    public class PersonWithDish

    {

        public string PersonName { get; set; }

        public string DishName { get; set; }

    }

    public class Person

    {

        public string Name { get; set; }

        public string Surname { get; set; }

    }

    public class Dish

    {

        public string Name { get; set; }

    }

}