public void AddToCart(string shoppingCartID, int productID, int quantity)
        {
            ShoppingCartItem myItem =
                (from c in _db.ShoppingCartItems
                 where c.ShoppingCartID == shoppingCartID && c.ProductID == productID
                 select c).FirstOrDefault();
            if (myItem == null)
            {
                var cartadd = new ShoppingCartItem
                                  {
                                      ShoppingCartID = shoppingCartID,
                                      Quantity = quantity,
                                      ProductID = productID,
                                      DateCreated = DateTime.Now,
                                      ModifiedDate = DateTime.Now
                                  };
                _db.ShoppingCartItems.AddObject(cartadd);
            }
            else
            {
                myItem.Quantity += quantity;
            }

            _db.SaveChanges();
        }
 /// <summary>
 /// Create a new ShoppingCartItem object.
 /// </summary>
 /// <param name="shoppingCartItemID">Initial value of the ShoppingCartItemID property.</param>
 /// <param name="shoppingCartID">Initial value of the ShoppingCartID property.</param>
 /// <param name="quantity">Initial value of the Quantity property.</param>
 /// <param name="productID">Initial value of the ProductID property.</param>
 /// <param name="dateCreated">Initial value of the DateCreated property.</param>
 /// <param name="modifiedDate">Initial value of the ModifiedDate property.</param>
 public static ShoppingCartItem CreateShoppingCartItem(global::System.Int32 shoppingCartItemID, global::System.String shoppingCartID, global::System.Int32 quantity, global::System.Int32 productID, global::System.DateTime dateCreated, global::System.DateTime modifiedDate)
 {
     ShoppingCartItem shoppingCartItem = new ShoppingCartItem();
     shoppingCartItem.ShoppingCartItemID = shoppingCartItemID;
     shoppingCartItem.ShoppingCartID = shoppingCartID;
     shoppingCartItem.Quantity = quantity;
     shoppingCartItem.ProductID = productID;
     shoppingCartItem.DateCreated = dateCreated;
     shoppingCartItem.ModifiedDate = modifiedDate;
     return shoppingCartItem;
 }
 /// <summary>
 /// Deprecated Method for adding a new object to the ShoppingCartItems EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead.
 /// </summary>
 public void AddToShoppingCartItems(ShoppingCartItem shoppingCartItem)
 {
     base.AddObject("ShoppingCartItems", shoppingCartItem);
 }