using (studentEntities entities =new studentEntities())
            {

                var item1 = (from c in entities.Score
                            group c by c.ID into g
                            select new
                            {
                                g.Key,
                                g
                            });

                foreach (var m in item1)
                {
                    if (m.Key == "11112")
                    {
                        foreach (var n in m.g)
                            Console.WriteLine(n.ID + "   " + n.course + "   " + n.score1);
                    }
                       
                }

class Program
    {
        static void Main(string[] args)
        {
            using (studentEntities entities = new studentEntities())
            {
                var v = from u in GetScore()
                        group u by u.Num into g
                        select new
                        {
                            Sss = g.Key,
                            Mdd = g
                        };

                foreach (var m in v)
                {
                    foreach(var n in m.Mdd)
                        Console.WriteLine(n.Num + "  " + n.Name + "  " + n.Fen);
                }

                Console.ReadLine();
            }
        }

        public static List<ScoreS> GetScore()
        {
            List<ScoreS> mylist = null;
            using (studentEntities entities = new studentEntities())
            {
                var v = from u in entities.Score
                        select new ScoreS
                        {
                            Num = u.ID,
                            Name = u.course,
                            Fen = u.score1
                        };

                mylist = v.ToList();
            }
            return mylist;
        }
    }