MVC 3中的强类型会话变量

public sealed class SessionManager : IRequiresSessionState
{
    private const string CurrentCultureKey = \"CurrentCulture\";
    public static Culture CurrentCulture
    {
        get
        {
            if (null != HttpContext.Current.Session[CurrentCultureKey])
                return (Culture)HttpContext.Current.Session[CurrentCultureKey];

            return Culture.En;
        }
        set
        {
            if (HttpContext.Current.Session != null)
            HttpContext.Current.Session[CurrentCultureKey] = value;
        }
    }
}