public IActionResult MultipleCheckbox()
        {
            MultipleCheckboxViewModel model = new MultipleCheckboxViewModel();

            foreach (var id in new string[] { "Donut", "Oreo", "Marshmallow", "Kitkat", "Nougat" })
            {
                model.Checkboxen.Add(new MultipleCheckboxViewModel.Checkbox()
                {
                    Selected = false,
                    ID       = id,
                    Text     = $"Snack {id}"
                });
            }

            return(View(model));
        }
        public IActionResult MultipleCheckbox2(MultipleCheckboxViewModel model)
        {
            var aangvinkteIds = model.Checkboxen.Where(c => c.Selected).Select(c => c.ID).ToList();

            return(Json($"Jij selecteerde de volgende snacks: {string.Join(',',aangvinkteIds)}."));
        }