Object selection

Hi.. I have three objects and I need to select those three objects in random and not in a order. can anyone help me? Below is the code I have for selecting in a particular order.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class Random : MonoBehaviour {
  
  public List targets;
  public Transform selectedTarget;
  
  private Transform myTransform;
 
  // Use this for initialization
  void Start () {
  targets = new List();
  selectedTarget = null;
  myTransform = transform; 
  AddAllEnemies();
  }
  
  public void AddAllEnemies()
  {
  GameObject[] go = GameObject.FindGameObjectsWithTag("Enemy");
  
  foreach(GameObject enemy in go)
  AddTarget(enemy.transform);
  }
  
  public void AddTarget(Transform enemy)
  {
  targets.Add(enemy);
  }
  
  private void SortTargetsByRandom() {
  targets.Sort(delegate(Transform t1, Transform t2) {
  return Vector3.Distance(t1.position, myTransform.position).CompareTo(Vector3.Distance(t2.position, myTransform.position));
  });
  }
  
  private void TargetEnemy() {
  if(selectedTarget == null) {
  SortTargetsByRandom();
  selectedTarget = targets[0];
  }
  else {
  int index = targets.IndexOf(selectedTarget);
  
  if(index < targets.Count - 1) {
  index++;
  }
  else {
  index = 0;
  }
  DeselectTarget();
  selectedTarget = targets[index];
  
  }
  SelectTarget();
  }
  
  private void SelectTarget() {
  selectedTarget.renderer.material.color = Color.red;
  }
  
  private void DeselectTarget() {
  selectedTarget.renderer.material.color = Color.blue;
  selectedTarget = null;
  }
  
  // Update is called once per frame
  void Update () {
  if(Input.GetKeyDown(KeyCode.Tab))
  {
  TargetEnemy();
  }
  
  }
 }