Sort() an arraylist in a different function that I initialised it!

[Andrea253]

public partial class images_Exercise2 : System.Web.UI.Page
{
    ArrayList numbers = new ArrayList();
 
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
 
    protected void Button1_Click(object sender, EventArgs e)
    {
 
        int num = 0;
        Random RandomClass = new Random();
        numbers.Clear();
 
        for (int i = 0; i < 6; i++)
        {
            num = RandomClass.Next(1, 49);
 
            while (!numbers.Contains(num))
            {
                numbers.Add(num);
            }
        }
 
 
        Label1.Text = numbers[0].ToString();
        Label2.Text = numbers[1].ToString();
        Label3.Text = numbers[2].ToString();
        Label4.Text = numbers[3].ToString();
        Label5.Text = numbers[4].ToString();
        Label6.Text = numbers[5].ToString();
 
 
 
 
    protected void Button2_Click(object sender, EventArgs e)
    {
        numbers.Sort();
        Label1.Text = numbers[0].ToString();
        Label2.Text = numbers[1].ToString();
        Label3.Text = numbers[2].ToString();
        Label4.Text = numbers[3].ToString();
        Label5.Text = numbers[4].ToString();
        Label6.Text = numbers[5].ToString();
 
 
    }
}

The problem is When I click on the Button_2 the arraylist lose all the data so i empty so I can't sort it! I couldn't find a way to keep the data in the arraylist! Can you help me?