ถามเรื่องการ write ข้อมูลลง xml โดยใช้ภาษา VB.net

Imports System.Xml
Imports System.IO
Imports System.Data
Public Class Config_DB1ServerIP
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    End Sub
    Protected Sub cmdsave_click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdsave.Click
        Dim DBServerIP As String
        Dim DBUsername As String
        Dim DBPassword As String
        Dim DBDatabaseName As String
        Dim DBTableName1 As String
        Dim DBTableName2 As String
        Dim DBTableName3 As String
        Dim DBTableName4 As String
        DBServerIP = DB1ServerIP1.Text
        DBUsername = DB1Username1.Text
        DBPassword = DB1Password1.Text
        DBDatabaseName = DB1DatabaseName1.Text
        DBTableName1 = DB1TableName11.Text
        DBTableName2 = DB1TableName21.Text
        DBTableName3 = DB1TableName31.Text
        DBTableName4 = DB1TableName41.Text
        If IO.File.Exists("Config.xml") = False Then
            'declare our xmlwritersettings object
            Dim settings As New XmlWriterSettings()
            'lets tell to our xmlwritersettings that it must use indention for our xml
            settings.Indent = True
            'lets create the MyXML.xml document, the first parameter was the Path/filename of xml file
            ' the second parameter was our xml settings
            Dim XmlWrt As XmlWriter = XmlWriter.Create("C:\Config.xml", settings)
            With XmlWrt
                ' Write the Xml declaration.
                .WriteStartDocument()
                ' Write the root element.
                .WriteStartElement("configuration")
                .WriteStartElement("DBServerIP")
                ' Start our first person.
                '.WriteStartElement("Person")
                ' The person nodes.
                'DB1ServerIP
                'DB1Username
                'DB1Password
                'DB1DatabaseName
                'DB1TableName1
                'DB1TableName2
                'DB1TableName3
                'DB1TableName4
                .WriteStartElement("DB1ServerIP")
                .WriteString(DBServerIP)
                .WriteEndElement()
                .WriteStartElement("DB1Username")
                .WriteString(DBUsername)
                .WriteEndElement()
                .WriteStartElement("DB1Password")
                .WriteString(DBPassword)
                .WriteEndElement()
                .WriteStartElement("DB1DatabaseName")
                .WriteString(DBDatabaseName)
                .WriteEndElement()
                .WriteStartElement("DB1TableName1")
                .WriteString(DBTableName1)
                .WriteEndElement()
                .WriteStartElement("DB1TableName2")
                .WriteString(DBTableName2)
                .WriteEndElement()
                .WriteStartElement("DB1TableName3")
                .WriteString(DBTableName3)
                .WriteEndElement()
                .WriteStartElement("DB1TableName4")
                .WriteString(DBTableName4)
                .WriteEndElement()
                ' The end of this person.
                .WriteEndElement()
                ' Close the XmlTextWriter.
                .WriteEndDocument()
                .Close()
            End With
            Response.Write("XML file saved.")
        End If
    End Sub
End Class