Здравствуйте, kudzu, Вы писали:

Можно вот так:

    [Serializable()]
    public struct FileRecord
    {
        public int FN { get; set; }
        public int SN { get; set; }
        public int BN { get; set; }
        public const string ADD = "ADD BRD:";        
        public const string BP = "BACK";
        public const string BT = "E32";
        public const string HBT = "ME32";
        public const string BS = "LOADSHARE";        
        public const string ADS = "ACTIVE";
        public FileRecord(int fn, int sn, int bn) : this()
        {
            FN = fn;
            SN = sn;
            BN = bn;
        }
    }
    public class Data
    {
        public string FileName { get; set; }
        public Data(string fileName)
        {
            this.FileName = fileName;
        }
        private Dictionary<int, FileRecord> AddValues(int startDictionaryKey)
        {
            return this.SelectCorrectionInformation().ToDictionary(key => startDictionaryKey++);
        }
        public IEnumerable<string> PrintValues()
        {
            var dic = this.AddValues(0);
            foreach (KeyValuePair<int, FileRecord> pair in dic)
            {
                yield return String.Format("FN = {0}, SN = {1}, BN = {2}",
                    pair.Value.FN,
                    pair.Value.SN,
                    pair.Value.BN);
            }
        }
        private IEnumerable<FileRecord> SelectCorrectionInformation()
        {
            var buf = File.ReadAllLines(this.FileName);
            foreach (var i in buf)
            {
                var data = new FileRecord(
                    GetNoFixedValue(i, 0), 
                    GetNoFixedValue(i, 1), 
                    GetNoFixedValue(i, 6));
                yield return data; 
            }
        }
        private int GetNoFixedValue(string input, int index)
        {
            return Convert.ToInt32(this.GetNumbersFrom(input.Split(',')[index]));
        }
        private string GetNumbersFrom(string input)
        {
            return new String(input.Where(value => "0123456789".Contains(value)).ToArray());
        }

Использование:

        static void Main(string[] args)
        {
            Data data = new Data("TextFile1.txt");
            var values = data.PrintValues();
            foreach (var i in values)
            {
                Console.WriteLine(i);
            }
            Console.ReadKey();
        }

Результат:
FN = 1, SN = 2, BN = 9
FN = 1, SN = 3, BN = 16
FN = 1, SN = 15, BN = 3

Вот полезная ссылка: Про метод ToDictionary