ASP.NET MVC - How to access Session data in places other than Controller and Views

Here is my version of a solution for this problem. Notice that I also use a dependency injection as well, the only major difference is that the "session" object is accessed through a Singleton

private iSession _Session;

private iSession InternalSession
{
    get
    {

        if (_Session == null)
        {                
           _Session = new SessionDecorator(this.Session);
        }
        return _Session;
    }
}

Here is the SessionDecorator class, which uses a Decorator pattern to wrap the session around an interface :

public class SessionDecorator : iSession
{
    private HttpSessionStateBase _Session;
    private const string SESSIONKEY1= "SESSIONKEY1";
    private const string SESSIONKEY2= "SESSIONKEY2";

    public SessionDecorator(HttpSessionStateBase session)
    {
        _Session = session;
    }

    int iSession.AValue
    {
           get
        {
            return _Session[SESSIONKEY1] == null ? 1 : Convert.ToInt32(_Session[SESSIONKEY1]);
        }
        set
        {
            _Session[SESSIONKEY1] = value;
        }
    }

    int iSession.AnotherValue
    {
        get
        {
            return _Session[SESSIONKEY2] == null ? 0 : Convert.ToInt32(_Session[SESSIONKEY2]);
        }
        set
        {
            _Session[SESSIONKEY2] = value;
        }
    }
}`

Hope this helps :)