You can create a Class that will handle the CartItem and store it on a Session. That way, you can access it on your other page.
Class CartItem
public class CartItem {
public decimal TotalCost { get; set; }
public List<string> Items { get; get; }
}
</string>
Page 1
Session["CartItems"] = cartItems;
Page 2
CartItems itemsFromPage2 = Session["CartItems"] != null ? (CartItems)Session["CartItems"] : null;