Can't access ApplicationState from MVC Controller

In my Application_Start method in the Global.asax I am setting the Application State to a string.  When I try and access it my controller I can't.  I thought I would access the Application State the same way as I do the Session State by saying:

string myvar = Application["MyString"];

When I try that, Application doesn't show up in Intellisense and I get the message: 'The name 'Application' does not exist in the current context'.

Here is a partial listing of my Application_Start method:

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        Application["MyString"] = "some value";
    }
}

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Can someone please tell me what I am doing wrong?