private void UpdateInstrument(InstrumentDetail instrumentDetail)
        {
            var instrument = _instrumentRepository.Get(instrumentDetail.Id);

            if (instrument != null)
            {
                instrument.Name = instrumentDetail.Name;
                instrument.Abbreviation = instrumentDetail.Abbreviation;
            };

            _instrumentRepository.Update(instrument);
        }
        private int AddInstrument(InstrumentDetail instrumentDetail)
        {
            var i = new Instrument
            {
                Name = instrumentDetail.Name,
                Abbreviation = instrumentDetail.Abbreviation
            };

            return _instrumentRepository.Add(i);
        }