session problem in asp.net mvc

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MVC4

I want to make condition in cshtml view based on userrole that should be in sitemenu class like this.

this.UserRole = userlist[0].UserRole.Tostring();

HttpContext.Session["UserRole"]=this.UserRole;

In view

<script>

var userRole=@HttpContext.Session["UserRole"].Tostring();

alert(userRole);

</script>

My problem is the session value is not displaying in alert box.

So how to handle this in my page using session. Because that is not controller if I want to use viewBag or ect.