public class eCommerce.Cart.BeforeDefaultPropertiesValueIsChangedArgs : Dynamicweb.Extensibility.NotificationArgs 

using Dynamicweb;
                            
  namespace Dynamicweb.Examples.CSharp.Notifications.eCommerce
  {
      [Dynamicweb.Extensibility.Subscribe(Dynamicweb.Notifications.eCommerce.Cart.BeforeDefaultPropertiesValueIsChanged)]
      public class EcomCartBeforeDefaultPropertiesValueIsChangedObserver : Dynamicweb.Extensibility.NotificationSubscriber
      {
          public override void OnNotify(string notification, Dynamicweb.Extensibility.NotificationArgs args)
          {
              Dynamicweb.Notifications.eCommerce.Cart.BeforeDefaultPropertiesValueIsChangedArgs beforeDefaultPropertiesValueIsChangedArgs = args as Dynamicweb.Notifications.eCommerce.Cart.BeforeDefaultPropertiesValueIsChangedArgs;

              //TODO: Add code here
          }
      }
  }