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Infinite Loop

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Message       shaggymac           Post subject: Infinite LoopPosted: Mon Aug 
24, 2009 8:09 am                        
Joined: Fri Feb 29, 2008 5:25 pm
Posts: 380              I can't understand why this code snippet will put me in 
an infinite loop.

Code:
Dim f As New FolderItem
Dim count As Integer
Dim counter As Integer
Dim field As String
Dim t As TextInputStream
Dim readLine As String

f = GetFolderItem("rb.data.csv")
counter = 0
If f <> Nil Then
  If f.Exists Then
  t = f.OpenAsTextFile
  readLine = t.ReadLine
  count = CountFields(readLine, ",")
  Do
  AAMCList.AddRow ""
  For counter = 0 To count
    field = NthField(readLine, ",", 1)
    Listbox1.Cell(Listbox1.LastIndex, 0) = field
  Next
  Loop Until t.EOF
  End If
End If

     
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