When I try access session variables in controller constructor ( public HomeController() ) i get exception, saying that object reference not set to instance of an object.

Code:

1        public class HomeController : Controller
2        {
3            private string samvar;
4    
5            public HomeController()
6            {
7                if (HttpContext.Session["test"] != null)                           // error line !
8                {
9                    samvar = (string)HttpContext.Session["test"];
10               }
11               else
12               {
13                   samvar = "test";
14                   HttpContext.Session["test"] = samvar;
15               }
16           }
17           public void Index()
18           {
19               RenderView("Index", samvar);
20           }

 The session context is not yet initialized when the controller constructor is called. Use application variables if you need to store some info before your action method is called