How to Sort images name in listbox control

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ASP.NET

I store multiple images path in listbox control.

protected void Button2_Click(object sender, EventArgs e)
    {
        string[] files = Directory.GetFiles("C:\\temp\\images", "*.jpg");
        foreach (string cfile in files)
        {
            ListBox3.Items.Add(cfile);

        }
    }

images names are

1.jpg
2.jpg
....
10.jpg
11.jpg 

but when i run above statement the listbox control will display

1.jpg
10.jpg
11.jpg
...
2.jpg
20jpg

so how to sort the listbox control so that list will display like

1.jpg
2.jpg
....
10.jpg
11.jpg