C# script to display score

I am trying to write a c# script to display a score and I have hit a bit of a snag. I want the score to display in screen with the current score in it but I cant seem to get it to display this is my current code:

 using UnityEngine;
 using System.Collections;
 
 public class score : MonoBehaviour 
 {
 
  static public int score1 = 0;
   
     
    void OnGUI() 
     {       
         GUI.Label(new Rect(10, 10, 100, 20),score1);   
     }
   
             
 
 }