public void UpdateItem(string updateCartID, int updateProductID, int quantity)
 {
     using (var _db = new ToyDemoProj.Models.ProductContext())
     {
         try
         {
             var myItem = (from c in _db.ShoppingCartItems
                           where c.CartId == updateCartID &&
                           c.Product.ProductID == updateProductID
                           select c).FirstOrDefault();
             if (myItem != null)
             {
                 myItem.Quantity = quantity;
                 _db.SaveChanges();
             }
         }
         catch (Exception exp)
         {
             throw new Exception("ERROR: Unable to Update Cart Item - " + exp.Message.ToString(), exp);
         }
     }
 }
        public void RemoveItem(String removeCartID, int removeProductID)
        {
            using (var _db = new ToyDemoProj.Models.ProductContext())
            {
                try
                {
                    var myItem = (from c in _db.ShoppingCartItems
                                  where c.CartId == removeCartID &&
                                  c.Product.ProductID == removeProductID
                                  select c).FirstOrDefault();
                    if (myItem != null)
                    {
                        _db.ShoppingCartItems.Remove(myItem);
                        _db.SaveChanges();
                    }
                }

                catch (Exception exp)
                {
                    throw new Exception("ERROR: Unable to remove cart item - "
                                        + exp.Message.ToString(), exp);
                }
            }
        }