using System;

using System.Linq;

using System.Collections.Generic;

using System.Globalization;

​

public static class ProductType

{

    public const int Products = 1;

    public const int Services = 2;

    public const int ProductsAndServices = 3;

    public const int Good = 4;

    public const int Other = 5;

};

​

public class Program

{

    public static void Main()

    {       

        var ListProductType = new List<(int, string)>

            {

                (ProductType.Products, "Products"),

                (ProductType.Services, "Services"),

                (ProductType.ProductsAndServices, "ProductsAndServices"),

                (ProductType.Good, "Good"),

                (ProductType.Other, "Other")

            };

        Console.WriteLine("Good {0}", string.Join(" | ", ListProductType.Where(c => c.Item2 == "Good").Select(c => c.Item1.ToString())));

    }

}