private static void WriteProductToList(Product p)
 {
     foreach (Product pr in ListOfProducts)
     {
         if (p.ArticleNumber1 == pr.ArticleNumber1)
         {
             Console.WriteLine("Findes allerede i systemet spasser :3");
         }
         else
         {
             ListOfProducts.Add(p);
         }
     }
 }
 public static void SkribListentilFil(Product p)
 {
     WriteProductToList(p);
     WriteObjectToFile("Products");
 }
 public static TEMPProductLoader(Product p)
 {
     LoadListOfProducts();
 }