VB.NET déplacer des fichier dans un autre répertoire en récursif

Bonjour!
J'ai un dossier contenant plusieurs documents xml. Mon programme fonctionne en batch (pas d'IHM).
Il parse tout les documents présent dans le dossier Documents et après traitement, il transfère le fichier dans le dossier backUp si il n'y a pas d'erreur sinon dans celui ToCorrect. Il ne déplace rien et j'ai compris pourquoi mais je ne vois pas comment régler le problème.
voici mon code:

Code:

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Private Sub ImportDoc_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
        Try
            'variable pour le dossier
            Dim sfiles As String()
            Dim nbFiles As String
            Dim i As Integer
            sFiles = Directory.GetFiles(documents)
            nbFiles = Directory.GetFiles(documents).Length()
            'Variable compteur d'erreur
            Dim errorCount As Integer = 0
            'Vérifie si le dossier est vide
            If nbFiles = 0 Then
                writeFile(vbDate & "No document today!")
                writeFile("-----------------------------------------------------------------------------------------")
            Else : writeFile(vbDate)
                For i = 0 To nbFiles - 1
                    Dim pathfile As String = sfiles(i)
                    Dim pathfileBackUp As String = sfiles(i)
                    Dim pathfileToCorrect As String = sfiles(i)
                    treatXMLDocuments(pathfile, errorCount)
                    writeFile("***********************************************")
                    If errorCount = 0 Then
                        'Envoye le document dans le dossier Back-up
                        File.Move(pathfile, pathfileBackUp)
                    Else 'Envoye le document dans toCorrect
                        File.Move(pathfile, pathfileToCorrect)
                    End If
                Next
                writeFile("-----------------------------------------------------------------------------------------")
            End If
        Catch ex As Exception
            writeFile(ex.ToString)
        End Try
 
    End Sub

Et aussi, je dois tester si un tag XML existe ou pas.
voici un extrait de mon code:

Code:

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Dim xmlDoc As XmlDocument = New XmlDocument()
            xmlDoc.Load(pathfile)
            'Traite la partie Header
            Dim element As XmlNodeList
            element = xmlDoc.DocumentElement.GetElementsByTagName("HEADER")
            Dim node, nodeChild As XmlNode
            For Each node In element
                For Each nodeChild In node.ChildNodes
                    Select Case nodeChild.LocalName
                        Case "DOCUMENTID"
                            documentID = nodeChild.InnerText
                        Case "INVOICENR"
                            invoiceNr = nodeChild.InnerText
                        Case "INTERNAL_REFERENCE"
                            internalRef = nodeChild.InnerText
                        Case "JOURNAL"
                            journal = nodeChild.InnerText
                        Case "CUSTOMERNUMBER"
                            customerNumber = nodeChild.InnerText
                        Case "INVOICEDATE"
                            invoiceDate = nodeChild.InnerText
                        Case "VATRATE"
                            vatRate = nodeChild.InnerText
                        Case "DUEPERIOD"
                            duePeriod = nodeChild.InnerText
                        Case "DUE_DATE"
                            dueDate = nodeChild.InnerText
                        Case "INVOICETYPE"
                            invoiceType = nodeChild.InnerText
                        Case "FINANCIAL_TYPE"
                            financialType = nodeChild.InnerText
                        Case "ATTENTIONOF"
                            attentionOf = nodeChild.InnerText
                        Case "COMPANY"
                            company = nodeChild.InnerText
                        Case "DEPARTMENT"
                            department = nodeChild.InnerText
                        Case "INVOICECURRENCY"
                            invoiceCurrency = nodeChild.InnerText
                        Case "EXCHANGE_RATE"
                            exchangeRate = nodeChild.InnerText
                        Case "INVOICEDESCRIPTION"
                            invoiceDescription = nodeChild.InnerText
                        Case "TOTALAMOUNT"
                            totalAmount = nodeChild.InnerText
                        Case "TOTALAMOUNTVAT"
                            totalAmountVat = nodeChild.InnerText
                        Case "VAT_NO"
                            vatNo = nodeChild.InnerText
                        Case "VAT_CODE"
                            vatCode = nodeChild.InnerText
                        Case "POSTINGDATE"
                            postingDate = nodeChild.InnerText
                        Case "GENERAL_LEDGER"
                            generalLedger = nodeChild.InnerText
                        Case "SOURCE"
                            source = nodeChild.InnerText
                        Case "INTERNAL_NO"
                            internalNo = nodeChild.InnerText
                        Case "COMPANYNR"
                            companyNr = nodeChild.InnerText
                        Case "INVOICE_NO_SUPPLIER"
                            invoiceNoSupplier = nodeChild.InnerText
                        Case "CREATE_TIMESTAMP"
                            createTimestamp = nodeChild.InnerText
                    End Select
                Next
            Next

Pourriez vous m'aider? Un grand merci d'avance ;)