Using streamwriter instead of printline in vb.net 2005

Hi,
Any suggestions on how to convert the following in streamwriter instead of printline.

Cheers

Public Sub PrintToLog()
      'print  in the log file
      Try
         If Not MessagesFile = String.Empty Then
            MsgFileUnit = FreeFile() 'Get next free file
            If MsgFileOpen OrElse frmmain.rbtbatch.Checked Then
               FileOpen(MsgFileUnit, MessagesFile, OpenMode.Append) 'Open the message file for append. Don't lose existing data
            ElseIf (Not ClearFile AndAlso Not frmmain.rbtbatch.Checked) Then
               FileOpen(MsgFileUnit, MessagesFile, OpenMode.Output) 'Open the message file for output. It clears all existing data
               MsgFileOpen = True
               ClearFile = True
            End If
            PrintLine(MsgFileUnit, List.Item(List.Count - 1).SubItems(0).Text.ToString.PadRight(10) & " " & List.Item(List.Count - 1).SubItems(1).Text) 'Output same message to messages text file                                               'Get next message
            FileClose(MsgFileUnit) 'Close the message file so the user can access it at any time
         End If
      Catch exSystem As System.UnauthorizedAccessException
         Loading = False
         FileClose(MsgFileUnit)
         AddMessage(FormatMessage(20, MessagesFile))
         FlagStop = True
      Catch ex As System.IO.IOException
         Loading = False
         FileClose(MsgFileUnit)
         AddMessage(FormatMessage(20, MessagesFile))
         FlagStop = True
      Catch ex As Exception
         AddMessage(ex.ToString)
         AddMessage(FormatMessage(20, MessagesFile))
         FileClose(MsgFileUnit)
         FlagStop = True
      End Try
   End Sub