public void PrepareSliders(IList <SelectListItem> items, bool withSpecialDefaultItem = true, string defaultItemText = null) { if (items == null) { throw new ArgumentNullException(nameof(items)); } var avilableSliders = _sliderService.GetAllSlider(); foreach (Slider avilableSlider in avilableSliders) { items.Add(new SelectListItem { Value = avilableSlider.Id.ToString(), Text = avilableSlider.Name }); } PrepareDefaultItem(items, withSpecialDefaultItem, defaultItemText); }