wp-handle-document-events-differently-with-udocumenteventhandler-01.cs

public class DocumentEventHandlerRegistration : ApplicationEventHandler
{
    protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        ContentService.Saving += ContentService_Saving;
    }

    private void ContentService_Saving(IContentService sender, SaveEventArgs<IContent> e)
    {
        if (e.SavedEntities.FirstOrDefault().ContentType.Alias == "documentTypeA")
        {
            // Do stuff
        }
    }
}