public void Updatelist()
        {
            api Listapi = new api();

            List <Shoppinglist> userShoppinglists = new List <Shoppinglist>();


            userShoppinglists = Listapi.GetShoppinglists(GlobalSettings.Id);
            if (userShoppinglists != null)
            {
                foreach (var shoppinglist in userShoppinglists)
                {
                    shoppinglists.Items.Add(shoppinglist);
                }
            }
        }