Случайный элемент массива в Unity3D

            Random r = new Random();
            int[] a = new int[5] { 1, 2, 3, 4, 5 };
            int rand = a[r.Next(0, a.Length - 1)];

using UnityEngine;
...
int[] array = new int[5];
int rElem = array[Random.Range(0, array.Length)];

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class RandomWall : MonoBehaviour
{
 
    public float XSize = 45f;
    public float ZSize = 45f;
    public float YRotation = 90f;
 
    public GameObject WallPrefab;
    public GameObject[] curWall = new GameObject[10];
 
    public Vector3 curPos;
 
    void Start()
    {
        
        for (int i = 5; i < curWall.Length; i++)
        {
            RandomPos();
            curWall[i] = Instantiate(WallPrefab, curPos, Quaternion.identity) as GameObject;
        }
 
        for (int i = 5; i < curWall.Length; i++)
        {
            RandomPos();
            curWall[i] = Instantiate(WallPrefab, curPos, new Quaternion (0, YRotation, 0, YRotation)) as GameObject;
            //curWall[0].transform.Rotate(new Vector3(0, YRotation, 0));
        }
        Debug.Log(curWall.Length);
    }
 
    void RandomPos()
    {
        curPos = new Vector3(Random.Range(XSize * -1, XSize), 0.25f, Random.Range(ZSize * -1, ZSize));
    }
}