How to process a txt file for parsing with a function in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace EE_Q29167461
{
    class Program
    {
        static void Main(string[] args)
        {
            var contents = System.IO.File.ReadAllLines($"{typeof(Program).Namespace}.txt").Where(x => x.IndexOf("ielastq", StringComparison.OrdinalIgnoreCase) > -1);
            var matches = contents.GetIElastiqById(10);
            foreach (var match in matches)
            {
                Console.WriteLine(match);
            }
            Console.ReadLine();
        }
    }

    static class Extensions
    {
        public static IEnumerable<string> GetIElastiqById(this IEnumerable<string> data, int id)
        {
            var parameter = default(int);
            return data.Where(x => 
                Regex.Match(x, @"\(([^)]+)\)").Groups.Count > 1 && 
                int.TryParse(Regex.Match(x, @"\(([^)]+)\)").Groups[1].Value.Trim(), out parameter) && 
                parameter == id
            );
        }
    }
}

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namespace ConsoleCS
{
    using System;
    using System.Collections.Generic;
    using System.Globalization;
    using System.IO;

    public class Program
    {
        public static void Main(string[] args)
        {
            IElastq ielastq = new IElastq(@"c:\temp\data.txt");
            var dataPoint = ielastq[10];
            Console.WriteLine(dataPoint);

            Console.WriteLine("\nDone.");
            Console.ReadLine();
        }
    }

    public class IElastq
    {
        private Dictionary<int, Tuple<string, string, double>> iElastq = new Dictionary<int, Tuple<string, string, double>>();

        public Tuple<string, string, double> this[int i]
        {
            get
            {
                return this.iElastq[i];
            }
        }

        public IElastq(string filename)
        {
            using (StreamReader file = new StreamReader(filename))
            {
                string line;
                bool inRefMod = false;
                while ((line = file.ReadLine()) != null)
                {
                    line = line.Trim();
                    if (inRefMod)
                    {
                        if (line.StartsWith("ielastq"))
                        {
                            int number = int.Parse(line.Substring(9, 4));
                            string description = line.Substring(33, 17).Trim();
                            double frequency = double.Parse(line.Substring(51, 14), new CultureInfo("en-US"));
                            string unit = line.Substring(65, line.Length - 65);
                            this.iElastq.Add(number, new Tuple<string, string, double>(description, unit, frequency));
                        }

                        if (line.Equals("end refmod"))
                        {
                            break;
                        }
                    }

                    if (line.Equals("refmod"))
                    {
                        inRefMod = true;
                    }
                }
            }
        }
    }
}

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                ielastq (  10)                  = Eigen Mode   16 :       16.921 Hz

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				Eigen Mode
				16
				16.921

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