(Emergency Simple Question) ListBox Naming by index

Hi,

I am trying to use index to assign 10, 30, 50, 70, and 90 to some list boxes names "listbox1", "listbox2", "listbox3", "listbox4", "listbox5".

(I have left the name of the listBoxes without any changing in default names)

Please look at this simple code:
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Public Class Form1
Dim MyNumbers(4) As Double
Dim listbox(i) As ListBox
Dim i As Integer
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click


For i As Integer = 0 To 4
MyNumbers(i) = 10 + 20 * i
ListBox(i).Items.Add(MyNumbers(i))


Next i
End Sub
End Class
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The error is "Index was outside the bounds of the array." and it does not get ListBox(1) as ListBox1! What should I do?

Thank you,
Onli