multiple buttons not working

i have multiple buttons and the code i have attached below the buttons don't work when i press them, while searching for solutions i found out that we have to create a local variable in the foreach but im a noob to programming i wasnt able to understand how to do it with respect to the code i have

         void Update()
         {
             StateManager sm = TrackerManager.Instance.GetStateManager();
             IEnumerable<TrackableBehaviour> tbs = sm.GetActiveTrackableBehaviours();
             foreach (TrackableBehaviour tb in tbs)
             {
                 string name = tb.TrackableName;
                 ImageTarget it = tb.Trackable as ImageTarget;
                 Vector2 size = it.GetSize();
                 Debug.Log(" Active image target:" +name + " -size:" +size.x +","+size.y);
                 MovieTitle.GetComponent<Text>().text = name;
                 Timeline.gameObject.SetActive(true);
                 castButton.gameObject.SetActive(true);
                 songsButton.gameObject.SetActive(true);
                 if (name == "ARMarker2"){
                 castButton.GetComponent<Button>().onClick.AddListener(delegate {
                     setCastActive();
                     
                 });
                 songsButton.GetComponent<Button>().onClick.AddListener(delegate {
                     setSongsActive();
                 });
                 MovieTitle.GetComponent<Text>().text = "SHOLAY";
                 }
                /* if (name == "ARMarker1")
 {
                 ButtonAction.GetComponent<Button>().onClick.AddListener(delegate {
                     playSound(" Sounds / HelloBabyGirl");
             });
                     TextDescription.GetComponent<Text>().text = " A robot is a mechanical or virtual artificial agent, usually an electromechanical machine that is guided by a computer program or electronic circuitry, and thus a type of an embedded system.";
                 }*/
             }
     }
                 //function to play sound
         void playSound(string ss)
         {
         clipTarget = (AudioClip)Resources.Load(ss);
         soundTarget.clip = clipTarget;
         soundTarget.loop = false;
         soundTarget.playOnAwake = false;
         soundTarget.Play();
         }
         void setCastActive() {
             castImage.gameObject.SetActive(true);
             Timeline.gameObject.SetActive(false);
             songsImage.gameObject.SetActive(false);
         }
         void setSongsActive() {
             castImage.gameObject.SetActive(false);
             songsImage.gameObject.SetActive(true);
             Timeline.gameObject.SetActive(false);
         }
         void setBRollActive() { }
         void setFactsActive() { }
         void setAwardsActive() { }
     }
 }