var query2 = st.Where(sub => sub.Subject == "Chemistry").GroupBy(cid => cid.ID); item.Key Console.WriteLine("ID :"+ item.Key + ": Count " +item.Count());
var query2 = st.Where(sub => sub.Subject == "Chemistry").GroupBy(cid => cid.ID);
item.Key Console.WriteLine("ID :"+ item.Key + ": Count " +item.Count());