How do I create SOAP message to my XML file?

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VB

.NET

Hi,
I can create XML file using XmlTextWriter (vb.net). How do I create and add that SOAP message to my same XML file?

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:eb="http://www.oasis-open.org/committees/ebxml-msg/schema/msg-header-2_0.xsd">
  <SOAP-ENV:Header>
    <eb:MessageHeader xmlns:eb="http://www.oasis-open.org/committees/ebxml-msg/schema/msg-header-2_0.xsd" SOAP-ENV:mustUnderstand="1" eb:version="2.0">
      <eb:From>
        <eb:PartyId>00371234567890</eb:PartyId>
        <eb:Role>Sender</eb:Role>
      </eb:From>
      <eb:From>
        <eb:PartyId>NDEAFIHH</eb:PartyId>
        <eb:Role>Intermediator</eb:Role>
      </eb:From>
      <eb:To>
        <eb:PartyId>00370987654321</eb:PartyId>
        <eb:Role>Receiver</eb:Role>
      </eb:To>
      <eb:To>
        <eb:PartyId>003710948874</eb:PartyId>
        <eb:Role>Intermediator</eb:Role>
      </eb:To>
      <eb:CPAId>yoursandmycpa</eb:CPAId>
      <eb:ConversationId>123123</eb:ConversationId>
      <eb:Service>Routing</eb:Service>
      <eb:Action>ProcessInvoice</eb:Action>
      <eb:MessageData>
      <eb:MessageId>123</eb:MessageId>
      <eb:Timestamp>2013-08-14T12:17:50</eb:Timestamp>
      <eb:RefToMessageId>456</eb:RefToMessageId>
      </eb:MessageData>
    </eb:MessageHeader>
  </SOAP-ENV:Header>
  <SOAP-ENV:Body>
    <eb:Manifest eb:id="Manifest" eb:version="2.0">
      <eb:Reference eb:id="Finvoice" xlink:href="200911180001">
        <eb:Schema eb:location="http://www.finvoice.info/finvoice.xsd" eb:version="2.0"/>
      </eb:Reference>
    </eb:Manifest>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>
<?xml version="1.0" encoding="ISO-8859-15"?>
<?xml-stylesheet href="Finvoice.xsl" type="text/xsl"?>

What I have tried:

This XML file I created with XmlTextWriter

<?xml version="1.0" encoding="iso-8859-15"?>
<?xml-stylesheet href='Finvoice.xsl' type='text/xsl'?>
<Finvoice Version="3.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="Finvoice3.0.xsd">
  <MessageTransmissionDetails>
    <MessageSenderDetails>
      <FromIdentifier SchemeID="0037">00371234567890</FromIdentifier>
      <FromIntermediator>NDEAFIHH</FromIntermediator>
    </MessageSenderDetails>
    <MessageReceiverDetails>
      <ToIdentifier SchemeID="0037">00371234567890</ToIdentifier>
      <ToIntermediator>00371234567890</ToIntermediator>
    </MessageReceiverDetails>
    <MessageDetails>
      <MessageIdentifier>12345</MessageIdentifier>
      <MessageTimeStamp>2023-05-11T12:29:36</MessageTimeStamp>
      <SpecificationIdentifier>EN16931</SpecificationIdentifier>
    </MessageDetails>
  </MessageTransmissionDetails>
  <SellerPartyDetails>
    <SellerPartyIdentifier>12345678</SellerPartyIdentifier>
    <SellerOrganisationName>Seller Company</SellerOrganisationName>
    <SellerOrganisationTaxCode>FI12345678</SellerOrganisationTaxCode>
    <SellerPostalAddressDetails>
      <SellerStreetName>Street 11</SellerStreetName>
      <SellerTownName>Town</SellerTownName>
      <SellerPostCodeIdentifier>12345</SellerPostCodeIdentifier>
      <CountryCode>FI</CountryCode>
      <CountryName>Suomi</CountryName>
    </SellerPostalAddressDetails>
  </SellerPartyDetails>
</Finvoice>