ALBERT SITE

var avg =

                (from prod in context.tcn_training_center_live_mov_comment.Where(x => x.language_cd == language_cd && x.company_seq == company_seq && x.ref_seq == mov_seq)

                select prod.grade_num).Average();

                string result = (avg==null) ? "0" : string.Format("{0,10:N1}", avg);

                return result;