public class HomeController : Controller  
    {
        private IApplicationContext applicationContext;

        public HomeController(IApplicationContext applicationContext)
        {
            this.applicationContext = applicationContext;
        }
 
        public IActionResult Index()  
        {    
            return View();
        }  
  
        public IActionResult About()  
        {  
            ViewBag.Name = applicationContext.User.Name;  
            ViewBag.Age = applicationContext.User.Age;
            ViewData["Message"] = "Asp.Net Core !!!.";  
  
            return View();  
        }  
  
        public IActionResult Contact()  
        {  
            ViewData["Message"] = "Your contact page.";  
  
            return View();  
        }  
  
        public IActionResult Error()  
        {  
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });  
        }  
    }  

public HomeController(IApplicationContext applicationContext)