var   myList = (from p in db.Full
                      where ( (p.date_reception > begin & p.date_reception < end & !p.mc_host_class.Contains("NULL")) &

                   (!strListe.Contains(p.mc_host_class)))
                      group p by p.mc_host_class into g
                      orderby g.Count() descending
                      select new
                      {
                          hostclassx = g.Key,
                          countx = g.Count()
                      }).Take(10).ToList();



           HttpContext.Current.Session["allList"] = myList;
           var list = (List<StringIntType>)HttpContext.Current.Session["allList"];

public class StringIntType
{

    public string str { get; set; }
    public int nbr { get; set; }
}

select new

select new StringIntType
  {
      str = g.Key,
      nbr = g.Count()
  }).Take(10).ToList();