Problem with High Score System using PlayerPrefs [C#]

Hi,

I'm trying my first PlayerPrefs high score system. I need to save the best score and time so I can have them display on the results screen and the high score screen. I'm using the solution from the example below as my base script: http://answers.unity3d.com/questions/20773/how-do-i-make-a-highscores-board.html

This is what I currently have:

 using UnityEngine;
 using System.Collections;
 
 public class HighScoreS1 : MonoBehaviour {
     
         int newScore;
         int newTime;
         int oldScore;
         int oldTime;
     
     void AddScore(int score, int time){
         newScore = score;
         newTime = time;
         
         for(i = 0; i < 10; i++){
             if(PlayerPrefs.HasKey(i + "HScore")){
                 if(PlayerPrefs.GetInt(i + "HScore") < newScore){
                     //new score is higher than the stored score
                     oldScore = PlayerPrefs.GetInt(i + "HScore");
                     oldTime = PlayerPrefs.GetInt(i + "HScoreTime");
                     PlayerPrefs.SetInt(i + "HScore",newScore);
                     PlayerPrefs.SetInt(i + "HScoreTime",newTime);
                     newScore = oldScore;
                     newTime = oldTime;
                 }
             } else{
                 PlayerPrefs.SetInt(i + "HScore",newScore);
                 PlayerPrefs.SetInt(i + "HScoreTime",newTime);
                 newScore = 0;
                 newTime = 0;
             }
         }
     }
 }

Any help is appreciated. Thanks.