public ActionResult Index()
        {
            Resistor res = new Resistor();

            ViewBag.DigitColors      = new SelectList(Enum.GetValues(typeof(BandDigitEnum)).Cast <BandDigitEnum>());
            ViewBag.MultiplierColors = new SelectList(res.GetBandMultiplierColor());
            ViewBag.TolleranceColor  = new SelectList(res.GetBandToleranceColor(), "Value", "Key");
            return(View(res));
        }