public static SlideViewModel Create(string id)
        {
            var slide = new SlideViewModel {
                Id = id
            };

            return(slide);
        }
        public static SectionViewModel Create(string name, int numberOfSlides)
        {
            var section = new SectionViewModel();

            section.Name   = name;
            section.Slides = new List <SlideViewModel>();

            for (int i = 0; i < numberOfSlides; ++i)
            {
                section.Slides.Add(SlideViewModel.Create($"{section.Name}, slide {i}"));
            }

            return(section);
        }