Linq删除

   DataClassesDataContext DC = new DataClassesDataContext();
        var query = from a in DC.Activities
                    where a.ZhangHao == "zb09nju"
                    select a;

        if(query.Count()>0)
        {
            Activities[] actiObjsArr=new Activities[query.Count()];
            int i=0;
            foreach(Activities item in query)
            {
                actiObjsArr[i]=item;
                ++i;
            }

            for (int n= 0; n < i; ++n)
            {
        DC.Activities.Remove(actiObjsArr[n]);
                DC.SubmitChanges();
        }
        }