Access the current session variable from another controller

I called a method from another controller using this

AnotherController oriCon = new AnotherController();
oriCon.ApproveOperation(formCollection, ref responseMsg);

Now, inside the ApproveOperation method, I called the session variable like this

int activeUser = (int)HttpContext.Session["user"];

But its giving me error; null value

I've asked before in forums.asp.net, someone told me to use

HttpContext.Current.Session

But I can't use that, there is no Current property in my HttpContext. Did I have no Current property because I'm using MVC 1.0 framework 3.5. Maybe the guy who answered me using MVC 2.0 framework 4.0?

Can anyone give me light on this?

What do you mean "called a method from another controller"?

I don't think you should be doing that. If its a common function that is used by two different controllers then put it in a separate class and then use it. You should be able to access Session from all your controller.