Date control won't hold value

I'm using an Infragistics date chooser but that's not the problem.  Code:

Sub Page_Load(....
    dateBirth.Value = Nothing
End Sub

Sub Button_Click(...
  response.write("Date Value is:" & dateBirth.Value)
End Sub

Result is:
"Date Value Is:"

If I remove the nothing assignment in page load I get the date that is picked.  If I leave it there the picked value is always nothing.

Why is that?
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Sub Page_Load(Byval sender As Object, ByVal e As EventArgs)
If Not IsPostBack Then
dateBirth.Value = Nothing
End If
End Sub

On every postback, the Page_Load gets fired first be4 anything else.

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MIKEVAuthor Commented:
One of these times the above answer's going to stick. :)  Thanks...
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