public int getValue(string type)
    {
        int res=0;
        if (type == "current")
        {
            if (HttpContext.Current.Session["current"] == null)
            {
                HttpContext.Current.Session.Add("current", 0);
            }
            res = int.Parse(HttpContext.Current.Session["current"].ToString());
        }
        if (type == "total")
        {
            if (HttpContext.Current.Session["total"] == null)
            {
                HttpContext.Current.Session.Add("total", 1);
            }
            res = int.Parse(HttpContext.Current.Session["total"].ToString());
        }
        return res;
    }