how to access a session variable from one to another controller in mvc 3

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MVC

following code is in one of my controller

var model1 = new Book();
model1.id = 1;
model1.BookName = "Life After Life";
model1.Author = "Kate Atkinson";
model1.Classification = "Fiction";
model1.Price = "CND $ 19.95";


Book model2 = new Book();
model2.id = 2;
model2.BookName = "River Of Stars";
model2.Author = "Guy Gavriel Kay";
model2.Classification = "Fiction";
model2.Price = "CDN $32.00";

Book model3 = new Book();
model3.id = 3;
model3.BookName = "Light";
model3.Author = "Michael Grant";
model3.Classification = "JUVENILE";
model3.Price = "CDN $20.99"

List<book> list = new List<book>();


list.Add(model1);
list.Add(model2);
list.Add(model3);
list.Add(model4);
list.Add(model5);

Session["var"] = list;
return View(list);

I want to access the same list in another controller without hardcoding the same list. The session varible is not working ...it returns null. Do How do i achieve this? is my syntax is wrong?.. I'm new to mvc 3 plz give me a specific explanation

Thank you