ActivEarth.DAO.RecentActivityDAO.UpdateGroupRecentActivity C# (CSharp) Метод

        public static bool UpdateGroupRecentActivity(Group group)
        {
            int groupId = group.ID;
            try
            {
                using (SqlConnection connection = ConnectionManager.GetConnection())
                {
                    var data = new ActivEarthDataProvidersDataContext(connection);
                    List<MessageDataProvider> messages = (from m in data.MessageDataProviders
                                                where m.group_id == groupId
                                                select
                                                    m
                                                ).ToList();

                    foreach (MessageDataProvider messageData in messages)
                    {
                        bool found = false;
                        foreach (Message message in group.Wall.Messages)
                        {
                            if (messageData.message == message.Text && messageData.user_id == message.Poster.UserID
                                && messageData.title == message.Title && messageData.time == message.Time && messageData.date == message.Date)
                            {
                                found = true;
                            }
                        }
                        if (!found)
                        {
                            data.MessageDataProviders.DeleteOnSubmit(messageData);
                        }
                    }

                    foreach (Message message in group.Wall.Messages)
                    {
                        bool found = false;
                        foreach (MessageDataProvider messageData in messages)
                        {
                            if (messageData.message == message.Text && messageData.user_id == message.Poster.UserID
                                && messageData.title == message.Title && messageData.time == message.Time && messageData.date == message.Date)
                            {
                                found = true;
                            }
                        }
                        if (!found)
                        {
                            MessageDataProvider messageData = new MessageDataProvider
                            {
                                title = message.Title,
                                message = message.Text,
                                user_id = message.Poster.UserID,
                                group_id = groupId,
                                date = message.Date,
                                time = message.Time
                            };
                            data.MessageDataProviders.InsertOnSubmit(messageData);
                        }
                    }

                    data.SubmitChanges();
                    return true;
                }
            }
            catch(Exception)
            {
                return false;
            }
        }