This is the code:

using System;

using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Microsoft.Extensions.Logging; using Umbraco.Cms.Core; using Umbraco.Cms.Core.Events; using Umbraco.Cms.Core.Models; using Umbraco.Cms.Core.Notifications; using Umbraco.Cms.Core.Services; using Umbraco.Cms.Core.Composing; using Umbraco.Cms.Core.DependencyInjection; using Umbraco.Extensions; using Umbraco.Cms.Core.Models.ContentEditing; using Umbraco.Cms.Core.Models.Membership;

namespace UGWCareRedTechExtension { public class ComponentFamilyServices { }

public class ComponentFamilyServices_SubscribeToContentServiceSavingComposer : IComposer
{
    // initialize: runs once when Umbraco starts

    public void Compose(IUmbracoBuilder builder)
    {
        builder.AddNotificationHandler<ContentSavingNotification, ComponentFamilyServicesContentSavingNotificationHandler>();
        builder.AddNotificationHandler<SendingContentNotification, ComponentFamilyServicesSendingContentNotificationHandler>();

    }


}


public class ComponentFamilyServicesSendingContentNotificationHandler : INotificationHandler<SendingContentNotification>
{
    private readonly ILogger<ComponentFamilyServicesSendingContentNotificationHandler> _logger;
    public ComponentFamilyServicesSendingContentNotificationHandler(ILogger<ComponentFamilyServicesSendingContentNotificationHandler> logger)
    {
        _logger = logger;
    }
    public void Handle(SendingContentNotification notification)
    {

        SimpleNotificationModel simpleNotificationModel = new SimpleNotificationModel();

        if (notification.Content.ContentTypeAlias== "componenteFamiliare")
        {
            simpleNotificationModel.AddInfoNotification("Notifica Componente in creazione", "In creazione");

            // Access the property you want to pre-populate
            // each content item can have 'variations' - each variation is represented by the `ContentVariantDisplay` class.
            // if your site uses variants, then you need to decide whether to set the default value for all variants or a specific variant
            // eg. set by variant name:
            // var variant = notification.Content.Variants.FirstOrDefault(f => f.Name == "specificVariantName");
            // OR loop through all the variants:
            foreach (var variant in notification.Content.Variants)
            {
                // Check if variant is a 'new variant'
                // we only want to set the default value when the content item is first created
                if (variant.State == ContentSavedState.NotCreated)
                {
                    // each variant has an IEnumerable of 'Tabs' (property groupings)
                    // and each of these contain an IEnumerable of `ContentPropertyDisplay` properties
                    // find the first property with alias 'publishDate'
                    var pubDateProperty = variant.Tabs.SelectMany(f => f.Properties)
                        .FirstOrDefault(f => f.Alias.InvariantEquals("publishDate"));
                    if (pubDateProperty is not null)
                    {
                        // set default value of the publish date property if it exists
                        pubDateProperty.Value = DateTime.UtcNow;
                    }

                    variant.Name = "Creating...";
                }
            }

        }
    }
}


public class ComponentFamilyServicesContentSavingNotificationHandler : INotificationHandler<ContentSavingNotification>
{
    private readonly ILogger<ComponentFamilyServicesContentSavingNotificationHandler> _logger;
    private INotificationService _notificationService;
    private IUser _user;
    public ComponentFamilyServicesContentSavingNotificationHandler(ILogger<ComponentFamilyServicesContentSavingNotificationHandler> logger )
    {
        _logger = logger;

    }
    public void Handle(ContentSavingNotification notification)
    {

        foreach (var content in notification.SavedEntities
            // Check if the content item type has a specific alias
            .Where(c => c.ContentType.Alias.InvariantEquals("componenteFamiliare")))
        {
            string cognome = content.GetValue<string>("cognome");
            string nome = content.GetValue<string>("nome");
            content.Name = cognome + " " + nome;
        }
    }
}

}