how to create a page index for a PDF document using iTextSharp with c# or vb.net code

I use iTextSharp dll and merge of multiple pdf documents.It's work very well but i can't create a index page on the first page of document (with reference at the page).can you help me with a simple code?
This is my function for merge pdf files:

Function CombineMultiplePDFs(ByVal fileNames As List(Of String), ByVal outFile As String, ByVal pathCartella As String) As String

Dim document As Document = New Document()
Dim writer As PdfCopy = New PdfCopy(document, New FileStream(outFile, FileMode.Create))

If writer Is Nothing Then
Return String.Empty
End If

document.Open()


For Each fileName As String In fileNames


Dim reader As PdfReader = New PdfReader(Path.Combine(outFile, fileName)) 'va nella cartella documenti anzichè nella cartella documentimerge
reader.ConsolidateNamedDestinations()

For i As Integer = 1 To reader.NumberOfPages
Dim page As PdfImportedPage = writer.GetImportedPage(reader, i)
writer.AddPage(page)

Next

Dim form As PRAcroForm = reader.AcroForm

If form IsNot Nothing Then
writer.CopyAcroForm(reader)
End If

reader.Close()
Next

writer.Close()
document.Close()

Return Path.Combine(pathCartella, Path.GetFileName(outFile))
End Function


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