How to see if a string in a string array is equal to a normal string in C#?

Hello all! I have an issue right now. Currently I have a function which will check to see if an array in a string is equal to one that I input into the function. However I have found out that something which stops the script from working properly is that a normal string seemingly cannot be equal to a string from a string array even if they are equal on sight (I have tested this via debug.log).

My question is how I can compare these two or convert one of them to allow proper comparison.

Here is my main script:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class dialogue : MonoBehaviour
 {
     public TextAsset dialogueFile; //The .txt file the script draws its dialogue lines from
 
     public string[] lineTitle; //the array that holds the titles of the dialogue line
     public string[] line;//the array that holds the actual contents of the dialogue line 
     public    GameObject sub;//The on-screen text object used to display the dialogue line
     private float timeHolder; // holds the countdown duration
     private bool timeOut = true; //Determines if time has run out for the subtitle's appearance yet. If this is false, the subtitle line will be deactivated
 
     void Start ()
     {
         sub.SetActive (false);
     }
     
     // Update is called once per frame
     void Update ()
     {
         //Starts Counting down 
         if (timeOut == false) {
             timeHolder -= Time.deltaTime;
             if (timeHolder < 0) {
                 sub.SetActive (false);
                 timeOut = true;
             }
         }
     }
 
     public void displayLine (string lineName, float duration)
     {
         string[] lines = dialogueFile.text.Split ('\n'); //Creates a string array from the .txt file
 
         timeHolder = duration;
 
         for (int g = 0; g<3; g++) {
             lineTitle [g] = lines [g * 3]; //puts line title in appropriate string array slot
             line [g] = lines [1+ (g * 3)]; //puts actual line in appropriate string array slot
 
             if (lineName==lineTitle [g]) { //The MAIN part which does not work. Should be comparing the line title to the line I input in a function. Displays the subtitle if this is true
                 sub.SetActive (true);
                 Debug.Log(lineTitle [g]);
                 sub.GetComponent<UnityEngine.UI.Text> ().text = line [g];
                 timeOut = false;
             }
         }
     }
 }

Here is what an example of the main "displayLine" function from the previous script being used:

 displayLine("testLine1",3);

Here is what the .txt file that I draw the dialogue lines from looks like (Placeholder lines):

 testLine1
 I am going to try and decide what to do
 //////////////////////////////
 testLine2
 Maybe this will work just fine?
 //////////////////////////////
 testLine3
 How about we try being certain about it?
 //////////////////////////////