c# - How to use Session Variable in MVC

Question

I have declared Session variable in "Global.asax" file as,

protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
            int temp=4;
            HttpContext.Current.Session.Add("_SessionCompany",temp);
        }

And want to use this Session Variable into My Controller's action as,

 public ActionResult Index()
        {
            var test = this.Session["_SessionCompany"];
            return View();
        }

But I am Getting Exception While accessing the Session Variable. Please help me on this that How can I access the Session Variable into my controller's Action.

I am getting an Exception like "Object Reference not set to an Insatance of an object" in Application_Start in Global.asax on line

HttpContext.Current.Session.Add("_SessionCompany",temp);

Answer 1

The thread that starts the Application is not the request thread used when the user makes a request to the web page.

That means when you set in the Application_Start, you're not setting it for any user.

You want to set the session on Session_Start event.

Edit:

Add a new event to your global.asax.cs file called Session_Start and remove the session related stuff from Application_Start

protected void Session_Start(Object sender, EventArgs e) 
{
   int temp = 4;
   HttpContext.Current.Session.Add("_SessionCompany",temp);
}

This should fix your issue.