private async void PlaceOrder_Clicked(object sender, EventArgs e)
        {
            Button button = (Button)sender;

            button.IsEnabled = false;
            try
            {
                PlaceOrderRequest placeOrderRequest = new PlaceOrderRequest()
                {
                    userId   = OperationData.userId,
                    itemId   = OperationData.CartItemList[0].id,
                    sellerId = OperationData.CartItemList[0].userId,
                    qty      = Convert.ToInt32(OperationData.CartItemList[0].numberOfItems)
                };
                var res = await cartViewModel.PlaceOrder(placeOrderRequest);

                if (res != null)
                {
                    if (res.Code == 0)
                    {
                        await DisplayAlert("Success!", "Order placed successfully with order number " + res.Data.orderNumber, null, "OK");

                        OrderData order = new OrderData()
                        {
                            itemId   = OperationData.CartItemList[0].id,
                            foodName = OperationData.CartItemList[0].foodName,
                            id       = res.Data.orderId,
                            SellerId = placeOrderRequest.sellerId
                        };
                        await PopupNavigation.PushAsync(new OrderItemStarRatingPopup(order));

                        Application.Current.MainPage = new NavigationPage(new MainPage());
                        OperationData.CartItemList.Clear();
                    }
                    else
                    {
                        await DisplayAlert("Something went wrong", "We could not place your order, Please try again.", null, "OK");
                    }
                }
                else
                {
                    await DisplayAlert("Something went wrong", "We could not place your order, Please try again.", null, "OK");
                }
            }
            catch (Exception ex)
            {
            }
            finally
            {
                button.IsEnabled = true;
            }
        }