how to use group by clause on the noticeID to select all these field in linq

var notice = (from n in context.Notice
                              join nd in context.NoticeDetail
                              on n.ID equals nd.NoticeID
                              where nd.SenderLocationID == locationID && nd.SenderActionID == sent && nd.Title !=""
                              select new
                                 {
                                     NoticeID = nd.NoticeID,
                                     NoticeDetailID = nd.ID,
                                     From = (currentLanguage == enmLanguage.English) ? nd.SenderPanchayatiRajLocation.Name : nd.SenderPanchayatiRajLocation.NameRegional,
                                     Subject = nd.Title,
                                     Date = nd.CreatedOn,
                                     Priority = (currentLanguage == enmLanguage.English) ? n.Priority.Name : n.Priority.Name_Regional,
                                     SentMail = context.NoticeRecipients.Where(a => a.NoticeDetailID == nd.ID).Count(),
                                     Replies = context.NoticeRecipients.Where(a => a.ReceiverLocationID == locationID && (a.ReceiverActionID == received || a.ReceiverActionID == read) && a.NoticeDetail.NoticeID == nd.NoticeID).Count()
                                 
                                 }).Distinct();
               
                notice = notice.OrderBy(s => s.Priority).ThenBy(s => s.Date);
                PagingBar1.Bind(notice, ref gvReceive);