public class DateRange : ValueObject {
    public DateRange(DateOnly start, DateOnly end) {
        if (start > end) {
            throw new InvalidDataException("");
        }
        Start = start;
        End = end;
    }

    public DateOnly Start { get; private init; }

    public DateOnly End { get; private init; }

    protected override IEnumerable<object> GetAtomicValues() {
        yield return Start;
        yield return End;
    }
}

public class Program : AggregateRoot<Guid> {
    public string Name { get; private set; }
    public DateRange DateRange { get; private set; }
    public List<Item> Items { get; private init; } = new();

    public void Update(string name, DateRange dateRange, IEnumerable<Item> items) {
          Name = name;
          DateRange = dateRange;
          Items.Clear();
          Items.AddRange(items);
      }
}

var program = await _programRepository.GetAsync(id);
program.Update(name, dateRange, items);
await _programRepository.UpdateAsync(program, true);