Gestion de stock, C#

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.ComponentModel;
namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            List<Article> Stock = new List<Article>()
            {
              new Article(1,"Art1",12.6,3),
              new Article(2,"Art2",100,2),
              new Article(3,"Art3",200,1),
              new Article(4,"Art4",150,12),
              new Article(6,"Art5",70.5,5)
            };
            Menu menu = new Menu(Stock);
            menu.GetArticleByRef(2).PrintArticle();
            Article art = new Article(5,"art_tgf",80,4);
            Console.WriteLine(menu.AddArticle(art));
            menu.PrintStock();
            menu.DeleteArticle(1);
            menu.UpdateArticle(3).PrintArticle();
            menu.PrintStock();
            //Console.WriteLine("Hello, world!");
        }
    }
    public class Article 
    {
        public Article(int refe,string nom,double price , int store)
        {
          Ref = refe;
          Nom = nom;
          Price = price;
          Store = store;
        }
        public int Ref {get;set;}
        public string Nom {get;set;}
        public double Price {get;set;}
        public int Store {get;set;}
        public void PrintArticle()
        {
            Console.WriteLine("#Article#");
            Console.WriteLine("Ref : "+this.Ref);
            Console.WriteLine("Nom : "+this.Nom);
            Console.WriteLine("Price : "+this.Price);
            Console.WriteLine("Quantité : "+this.Store);  
            Console.WriteLine("/*******/");
        }
        
    }
    public class Menu 
    {
        private List<Article> Stock {get;set;}
        public Menu(List<Article> stock)
        {
            this.Stock = stock;
        }
        public Article GetArticleByRef(int refe)
        {
           return this.Stock.Find(prm=>prm.Ref==refe);
        }
        public string AddArticle(Article art)
        {
            if(this.Stock.Any(prm=>prm.Ref==art.Ref))
                return "Reférence existe déja!";
            else 
            {
                this.Stock.Add(art);
                return "l'article a été bien ajouté";
            }
        }
        public void DeleteArticle(int refe)
        {
            this.Stock.Remove(this.Stock.Find(prm=>prm.Ref==refe));
        }
        public Article UpdateArticle(int refe)
        {
            foreach(var item in this.Stock.Where(prm=>prm.Ref==refe))
            {
                item.Nom = "hello";
                break;
            }
            return this.Stock.Find(prm=>prm.Ref==refe);
        }
        public void PrintStock()
        {
            this.Stock.ForEach(prm=>{
                prm.PrintArticle();
            });
        }
    }
}

Show compiler warnings [ + ] Show input
Temps de compilation : 0,92 s, temps d'exécution absolu : 0,26 s, temps CPU : 0,16 s, pic de mémoire : 40 Mo, temps de service absolu : 1,29 s