I want to set play scene of network lobby manger through script

I have tried

     private void Awake()
     {
          //It won't Compile without ToString();
         playScene = SceneManager.GetSceneByBuildIndex(5).ToString();
     }

and I have tried to make an array of Scenes

     Scene[] Scenes;

     private void Awake()
    {
      Scenes = new Scene[10];
       for(int i = 0  ;  i <   SceneManager.SceneCountInBuildSettings;  i++)
        {
                  Scenes[i] =  SceneManager.GetSceneByBuildIndex(i);
        }
        //It won't Compile without ToString();
       playScene = SceneManager.GetSceneByBuildIndex(PlayerPrefs.GetInt("Level")).ToString(); 
    }