Profile: Boyko

private readonly ShippingSettings shippingSettings;

shippingSettings = EngineContext.Current.Resolve<ShippingSettings>();

Hi well,

You should assign the private field _shippingSettings before returning it. The change is in bold. Also it should not be readonly as you won't be able to assign it.

private ShippingSettings _shippingSettings;

        public ShippingSettings ShippingSettings
        {
            get
            {
                if (_shippingSettings == null)
                {
                    _shippingSettings = EngineContext.Current.Resolve<ShippingSettings>();
                }

                return _shippingSettings;
            }
        }