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I've a simple pattern I like to use in cases such as these.  I call it the comparator pattern.  Here's a simple Console app that can be used to describe a possible solution.

I hope this helps

class Program
        static void Main(string[] args)
            var productA = new Product("Red", "Shoes", "10", "Rubber");
            var productB = new Product("Red", "Shoes", "10", "Rubber");
            var productC = new Product("Green", "Shoes", "8", "Plastic");

            if (productA.IsEqualTo(productB)){Console.WriteLine("Product A and Product B are the same");}
            if (!productB.IsEqualTo(productC)){Console.WriteLine("Product B and Product C are NOT the same"); }



    public class Product
        private readonly string color, name, size, material;

        public Product(string color, string name, string size, string material)
            this.color = color;
   = name;
            this.size = size;
            this.material = material;

        public bool IsEqualTo(Product product)
            return (product.color == color && == name) && product.material == material;

Sameer Lamba, Apr 18, 2012
Thats a good point and one possible answer. I think thats why singleton class can be used for state mangement in stateless scenarios like shopping cart scenario,
Apr 17, 2012
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