public ActionResult DisplayFibonacciSequence(FibonacciRequest req)
        {

            if (ModelState.IsValid)
            {
                var model = new Fibonacci();
                model.Sequence = new FibonacciGenerator().Generate(req.num);
                return View(model);
            }
            return View("FibonacciRequest",req);
        } 
 public ActionResult FibonacciRequest()
 {
     var model = new FibonacciRequest();
     return View(model);
 }