//Model

​

using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.Linq;

using System.Web;

​

namespace ProjectName

{

    public class Product

    {

        [Required]

        public int ProductID { get; set; }

    }

​

    public class ProductCombination

    {

        [Required]

        public Product ProductOne { get; set; }

​

        [Required]

        public Product ProductTwo { get; set; }

    }

​

    public class ProductList

    {

        public List<ProductCombination> ProductCombinations;

    }

}

​

​

​

//Controller

namespace ProjectName

{

    public class CalculatorController

    {

        public ActionResult Index()

        {

            var productFirst = new Product();

            var productSecond = new Product();

            var combo = new ProductCombination();

            combo.ProductOne = productFirst;

            combo.ProductTwo = productSecond;

            List<ProductList> ProductList = new List<ProductList>();

            //how to populate this ProductList ????

            return View(ProductList);

        }

    }

}