My function using best on version 3,4,5 but don't using version 6, can you help me.

public static bool AddToShoppingCart(int skuId, int quantity)
{
try
{
// Get current shopping cart
ShoppingCartInfo cart = ECommerceContext.CurrentShoppingCart;
if (cart == null)
{
// If current shopping cart hasn't been created yet -> create new empty one
cart = ShoppingCartInfoProvider.CreateShoppingCartInfo(CMSContext.CurrentSite.SiteID);
// Associate new shopping cart with the current session
ECommerceContext.CurrentShoppingCart = cart;
}
// Ensure shopping cart is saved to DB
if (cart.ShoppingCartID == 0)
{
ShoppingCartInfoProvider.SetShoppingCartInfo(cart);
}
// Add item to the shopping cart
ShoppingCartItemInfo product = cart.AddShoppingCartItem(skuId, quantity, null);
// Update shopping cart item in database
ShoppingCartItemInfoProvider.SetShoppingCartItemInfo(product);
// Update product options in database
foreach (ShoppingCartItemInfo option in product.ProductOptions)
{
ShoppingCartItemInfoProvider.SetShoppingCartItemInfo(option);
}

return true;
}
catch { }
return false;
}