public IActionResult First()
        {
            TempData["Title"]  = "First";
            TempData["Title2"] = "First";

            ViewBag.Page = "First";


            TempDataDto tempDataDto = new TempDataDto();

            return(View("Ortak", tempDataDto));
        }
        public IActionResult third()
        {
            string val  = TempData["Title"]?.ToString();
            string val2 = TempData["Title2"]?.ToString();

            ViewBag.Page = "third";
            TempDataDto tempDataDto = new TempDataDto()
            {
                Title  = val,
                Title2 = val2
            };

            return(View("Ortak", tempDataDto));
        }
        public IActionResult Second()
        {
            string val  = TempData.Peek("Title")?.ToString();// TempData["First"] boş değilse tosting e çevir.
            string val2 = TempData["Title2"]?.ToString();

            ViewBag.Page = "Second";

            TempDataDto tempDataDto = new TempDataDto()
            {
                Title  = val,
                Title2 = val2
            };

            return(View("Ortak", tempDataDto));
        }