using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var carOne = new Car()

        {color = "Yellow", year = 2008, index = 1, name = "Car One"};

        var carTwo = new Car()

        {color = "Yellow", year = 2008, index = 2, name = "Car Two"};

        var carThree = new Car()

        {color = "Yellow", year = 2009, index = 3, name = "Car Three"};

        var carFour = new Car()

        {color = "Red", year = 2012, index = 4, name = "Car Four"};

        var carFive = new Car()

        {color = "Red", year = 2012, index = 5, name = "Car Five"};

        var lstCars = new List<Car>() {carOne, carTwo, carThree, carFour, carFive};

        var groupCars = lstCars.GroupBy(x => new {x.color, x.year}).Select(t => new{Color = t.Key.color, Year = t.Key.year, ListCount = t.Count(), Names = t.Select(z => z.name).ToList()}).ToList();

        foreach (var item in groupCars)

        {

            Console.WriteLine("{0} \t List Count - {1}", item.Color, item.ListCount);

            Console.WriteLine("\t{0}", item.Year);

            foreach (var name in item.Names)

            {

                Console.WriteLine("\t\t" + name);

            }

​

            Console.WriteLine("\n");

        }

    }

}

​

public class Car

{

    public string color;

    public int year;

    public int index;

    public string name;

}