DataTable dt1 = new DataTable();
            DataTable dt2 = new DataTable();

            dt1 = new DataTable();
            dt1.Columns.Add(new DataColumn("ID", typeof(int)));
            dt1.Columns.Add(new DataColumn("Word", typeof(string)));

            dt2 = dt1.Copy();

            var e1 = from c in m_Word.m_Dataset.ADDWord.AsEnumerable()
                     select new { ID = c.Field<Int32>("ID"), Word = c.Field<string>("Word") };
            foreach (var result in e1)
            {
                dt1.Rows.Add(new object[2] { result.ID, result.Word });
            }

            var rez1 = from c in dt1.AsEnumerable()
                       select new { ID = c.Field<Int32>("ID"), Word = c.Field<string>("Word") };
////----------тут процедура заполнения ADDWord новыми данными

            var e2 = from c in m_Word.m_Dataset.ADDWord.AsEnumerable()
                     select new { ID = c.Field<Int32>("ID"), Word = c.Field<string>("Word") };

            foreach (var result in e2)
            {
                dt2.Rows.Add(new object[2] { result.ID, result.Word });
            }


            var rez2 = from c in dt2.AsEnumerable()
                       select new { ID = c.Field<Int32>("ID"), Word = c.Field<string>("Word") };
            var e3 = rez2.Except(rez1);

            foreach (var result in e3)
            {
                MessageBox.Show(result.Word);
                //перебор записей для нужд
            }


            return;