public void Execute()
        {
            try {
                using (var command =
                           new SQLiteCommand(Resources.SQL_SELECT_CATEGORY_BY_COMPETITION, _conn.DbConnection)) {
                    command.Parameters.AddWithValue("@COMPETITION_ID", _competitionDto.ID);
                    using (var reader = command.ExecuteReader()) {
                        Categories = new List <AbsoluteCategory>();
                        while (reader.Read())
                        {
                            int[] id            = { reader.GetInt32(2), reader.GetInt32(3) };
                            var   childCategory = new CompetitionService().SelectCategoryByAbsoluteCategories(id);

                            var category = new AbsoluteCategory {
                                Id        = reader.GetInt32(0),
                                Name      = reader.GetString(1),
                                CategoryM = childCategory.ElementAt(0),
                                CategoryF = childCategory.ElementAt(1)
                            };

                            Categories.Add(category);
                        }
                    }
                }
            }
            catch (SQLiteException) {
                _conn.DbConnection?.Close();
                throw;
            }
        }