I have a object with properties that are expensive to compute, so they are only calculated on first access and then cached.

 private List<Note> notes;
 public List<Note> Notes
    {
        get
        {
            if (this.notes == null)
            {
                this.notes = CalcNotes();
            }
            return this.notes;
        }
    }

I wonder, is there a better way to do this? Is it somehow possible to create a Cached Property or something like that in C#?