How put score in a quizgame in unity3d

Question

how can i maintain the score in my quiz game every time it change it's question it also reset the score to zero here is my method

 public void UserSelectTrue()
{  
    animator.SetTrigger("True");
    if (currentQuestion.isTrue)
    {
        countScore = countScore + 2;
        SetScoreText();
        Debug.Log("Correct");
    }
    else
    {
        Debug.Log("Wrong");
    }     
    StartCoroutine(TransitionToNextQuestion());
}
public void UserSelectFalse()
{
    animator.SetTrigger("False");
    if (!currentQuestion.isTrue)
    {
        countScore = countScore + 2;
        SetScoreText();
        Debug.Log("Correct");
    }
    else
    {
        Debug.Log("Wrong");
    }
    StartCoroutine(TransitionToNextQuestion());
}

Answer 1

you can use Singleton pattern with DontDestroyOnload to keep only one instance of the object between the scenes, be aware of the fact that DontDestroyOnload means the object won't be destroyed when a new scene loads

 public class ScoreManager: MonoBehaviour
 {
     private static ScoreManager_instance ;

     void Awake()
     {
         //we will make an instance if we don't have one yet
         if(!_instance)
             _instance = this ;
         //if we have an instance we don't need this one so we Destroy it
         else
             Destroy(this.gameObject) ;

          //we can keep this object between the scense with DontDestroyOnLoad
         DontDestroyOnLoad(this.gameObject) ;
     }
 }