public class BasketService 
      { 
          public static List<Product> GetBasketProducts() 
          { 
              List<Product> productList = new List<Product>(); 
              if (HttpContext.Current.Session["BasketProducts"] == null) 
              { 
                  return productList; 
              } 
              else 
              { 
                  productList = (List<Product>)HttpContext.Current.Session["BasketProducts"]; 
                  return productList; 
              } 
          } 
   
          public static void InsertProductToBasket(Product product) 
          { 
              List<Product> productList = new List<Product>(); 
              productList = (List<Product>)HttpContext.Current.Session["BasketProducts"]; 
              productList.Add(product); 
              HttpContext.Current.Session["BasketProducts"] = productList; 
          } 
   
          public static void DeleteProductFromBasket(int productID) 
          { 
              List<Product> productList = new List<Product>(); 
              productList = (List<Product>)HttpContext.Current.Session["BasketProducts"]; 
              productList = productList.Where(k => k.ProductID != productID).ToList(); 
              HttpContext.Current.Session["BasketProducts"] = productList; 
          } 
   
   
          public static void ClearBasket(int productID) 
          { 
              List<Product> productList = new List<Product>(); 
              HttpContext.Current.Session["BasketProducts"] = productList; 
          } 
      }