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Request.Form sometimes returns a flag value, in other cases

Does anyone know what happened to this? I have a classic ASP code that checks the value of a checkbox, for example:

<!-- HTML page: page1.asp --->
<input id="useBilling" name="useBilling" value="Y" type="checkbox" />

And on my code page (let her call page2.asp):

' code

useBilling = Request.Form("useBilling")

' useBilling should be "Y" here

If useBilling = "Y" Then
    ' using billing info
Else
    ' not using billing info
End If

The problem is that sometimes even when the checkbox is checked, it passes an empty string to Request.Form and the wrong code is executed. I put a few calls to Response.Write to track it (this is VBScript, remember), and sometimes it says that the value is "Y", but later, when I check the value in the conditional, it is empty.

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If useBilling = "Y" Then
  Response.Write "Cool, it works!"
Else
  Response.Write "Something weird. " & Request.Form
End If
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