DataAdapter.Update

cmInsert = new OleDbCommand("INSERT INTO Предметы(subject_name_rus, subject_name_eng) VALUES(@subject_name_rus, @subject_name_eng)", coJDiploma);
			cmInsert.Parameters.Add(new OleDbParameter("@subject_name_rus", OleDbType.VarChar, 255, ParameterDirection.Input, false, 0, 0, "subject_name_rus", DataRowVersion.Original, null));
			cmInsert.Parameters.Add(new OleDbParameter("@subject_name_eng", OleDbType.VarChar, 255, ParameterDirection.Input, false, 0, 0, "subject_name_eng", DataRowVersion.Original, null));
			cmUpdate = new OleDbCommand("UPDATE Предметы SET subject_name_rus=@subject_name_rus AND subject_name_eng=@subject_name_eng WHERE id=@id", coJDiploma);
			cmUpdate.Parameters.Add(new OleDbParameter("@id", OleDbType.Integer, 10, ParameterDirection.Input, false, 0, 0, "id", DataRowVersion.Original, null));
			cmUpdate.Parameters.Add(new OleDbParameter("@subject_name_rus", OleDbType.VarChar, 255, ParameterDirection.Input, false, 0, 0, "subject_name_rus", DataRowVersion.Original, null));
			cmUpdate.Parameters.Add(new OleDbParameter("@subject_name_eng", OleDbType.VarChar, 255, ParameterDirection.Input, false, 0, 0, "subject_name_eng", DataRowVersion.Original, null));
			cmDelete = new OleDbCommand("DELETE * FROM Предметы WHERE id=@id", coJDiploma);
			cmDelete.Parameters.Add(new OleDbParameter("@id", OleDbType.Integer, 10, ParameterDirection.Input, false, 0, 0, "id", DataRowVersion.Original, null));
			daJDiploma.InsertCommand = cmInsert;
			daJDiploma.UpdateCommand = cmUpdate;
			daJDiploma.DeleteCommand = cmDelete;

foreach(ListViewItem lvi in lvAllSubjects.Items)
			{
				if(lvi.SubItems[2].Text != "0")
				{
					dsSubjects.Tables["Предметы"].Select("id="+lvi.SubItems[2].Text)[0][1] = lvi.SubItems[0].Text;
					dsSubjects.Tables["Предметы"].Select("id="+lvi.SubItems[2].Text)[0][2] = lvi.SubItems[1].Text;
				}
				else
					dsSubjects.Tables["Предметы"].Rows.Add(new object[]{null, lvi.Text, lvi.SubItems[1].Text});
			}
			daJDiploma.Update(dsSubjects.Tables["Предметы"]);

INSERT INTO Предметы(subject_name_rus, subject_name_eng) VALUES(?, ?) 

cmInsert.Parameters.Add(new OleDbParameter("@subject_name_rus", OleDbType.VarChar, 255, ParameterDirection.Input, false, 0, 0, "subject_name_rus", DataRowVersion.Current, null));