C# Associate datas to other datas

using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Collections;
using System.Text.RegularExpressions;
using UnityEngine;
using System;

public class Recup_donnees_6 : MonoBehaviour {

    // When the script instance is being loaded
    void Awake ()
    {
        Application.targetFrameRate = 25; // To indicate : 25 Fps (Frame per rate)
    }

            // Use this for initialization
         void Start() // We need to get datas from a text file (so only once time)
        {

            // Create an instance of StreamReader to read from a file
            StreamReader reader = new StreamReader ("Suj01_PI_DP_C00_1.txt");

            using (reader) { // Automatic Closing of the Stream after working with it , otherwise we would have to write "reader.Close" at the end to close the stream, beneath the last command's line of this part "class FileReader"

                string line = " ";
                int lineNumber = 10; // The first line of the text file is the number 0
                // skip first 10 lines
                for (int i = 0; i < lineNumber; i++) {


                    line = reader.ReadLine();
                    if (line == null) return; // this ensures that the file has at least 12 lines
                }

                // At this point our line contains row #10 (Suj01:RIAS,,,Suj01:LIAS,,,Suj01:LIPS,,,Suj01:RIPS,,,Suj01:DSTR,,,Suj01:C7,,,Suj01:RACR,,,)
                string line_10;
                line_10 = line; // To indicate that the line #10 we read with the string "line" corresponds to the string "line_10"
                string[] names = line_10.Split (new String[] {",",",,,"},StringSplitOptions.RemoveEmptyEntries); // Every name is separating by ',,,' and the first is writing behind ','

                line = reader.ReadLine(); // Here it's line #11 (Field #,X,Y,Z,X,Y,Z,X,Y,Z,X,Y,Z,X)
                // To parse it and use it however you need
                string line_11;
                line_11 = line;
                string[] axes = line_11.Split(new String[] {"Field #",","},StringSplitOptions.RemoveEmptyEntries); // Every axe is separating by ',' and the first is writing behind 'Field #,'
           

                int counter = 0;
                while (line != null) { // Until the end of the text file
                    counter++;
                    line = reader.ReadLine(); // Here the loop starts getting data
                    if ((counter %3) != 1)
                    continue;
                    // if it is exactly 1 (lines 1, 5, 9 etc) continue working
                    // here you're beginning with the lines you need to enter into the matrix
                    // (1,-242.807816,1106.551270,1097.119385,14.437944,1075.778687,)
                    string lines_datas; // To create a matrix which contains 1 line / 4 from text file
                    lines_datas = line;
                    string[] datas;
                    datas = lines_datas.Split(new string[] {","},StringSplitOptions.RemoveEmptyEntries); 

                    line = reader.ReadLine(); // This needs to be last line in the while so you can continue the loop


                }
            }

    }
}