where do i need tu put my events so they can be trigged ? this is my exampel code, i want this to be trigged on Published. i have my code in APP_DATA

using System.Linq;
using Umbraco.Core;
using Umbraco.Web;
using Umbraco.Core.Composing;
using Umbraco.Core.Events;
using Umbraco.Core.Models;
using Umbraco.Core.Services;
using Umbraco.Core.Services.Implement;
using Umbraco.Core.Logging;

namespace Extranet.Components
{
    [RuntimeLevel(MinLevel = RuntimeLevel.Run)]
    public class ProjectComposer : IUserComposer
    {
        public void Compose(Composition composition)
        {

        }
    }

    public class ProjectComponent : IComponent
    {

        //inject in the core Logger service
        private readonly ILogger _logger;
        public ProjectComponent(ILogger logger)
        {
            _logger = logger;

        }

        public void Initialize()
        {
            ContentService.Published += this.ContentService_Published;
        }

        public void Terminate()
        {
            //unsubscribe during shutdown
            // unsubscribe on shutdown
            ContentService.Published -= ContentService_Published;
        }


        private void ContentService_Published(Umbraco.Core.Services.IContentService sender, Umbraco.Core.Events.ContentPublishedEventArgs e)
        {
            // the custom code to fire everytime content is published goes here!
            _logger.Info<ProjectComponent>("Something has been published...");
            foreach (var publishedItem in e.PublishedEntities)
            {
                _logger.Info<ProjectComponent>(publishedItem.Name + " was published");
            }
        }



    }
}