ui.text string matching doesn't work

i have a C# source code w$$anonymous$$ch looks like t$$anonymous$$s:

     public Text txtState;
 
     void Start () {
         txtState = txtState.GetComponent <Text> ();
         txtState.text = "1";
     }
 
     void Update () {
         if (string.Equals(txtState.text,"1")) {
             btnA.onClick.AddListener (delegate {txtState.text = "2"; Debug.Log("going state 2");});
         }else if (string.Equals(txtState.text,"2")){
             btnB.onClick.AddListener (delegate {txtState.text = "3"; Debug.Log("going to state 3");});
         }//else if statement goes on
      }

when i try to run it and click on btnA , and then clicked it the second time, the statement inside the first condition statement is still accepted (when it should not) even after changing the value txtState.text to 2. Please help, i'm a beginner in using C# and Unity so i'm clueless on what i'm doing wrong ):