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Assuming this is in a method called something meaningful like GetNumberOfLines(byval fileName As String)...From the hip:

Dim sr as StreamReader = Nothing

Try
  sr  = New StreamReader(fileName)
  Dim numberOfLines As Integer = 0

  ''read the line, don't care about the value so don't bother storing it
  While Not sr.ReadLine() Is Nothing
     numberOfLines += 1
  End While

  return numberOfLines
Catch ex As Exception
  ''something went wrong
Finally
  If not sr Is Nothing Then
     sr.Close()
  End If

  sr = nothing  'paranoid
End Try

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