how to retrieve arraylist items in reverse order

private void Form1_Load(object sender, EventArgs e)
{
    // ArrayList contains Customer names
    ArrayList arrayList = new ArrayList();
    arrayList.Add("Customer1");
    arrayList.Add("Customer2");
    arrayList.Add("Customer3");
    arrayList.Add("Customer4");
    arrayList.Add("Customer5");

	//reversing the array
    arrayList.Reverse();
    string str = string.Empty;
    foreach (string strName in arrayList)
     {
           str += strName + "\n";
     }
     string str = string.Empty;
     for (int i = arrayList.Count - 1; i >= 0; i--)
     {
       str += arrayList[i].ToString() + "\n";
     }