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Editorial Team
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Asked: 2026-05-21T06:54:17+00:00

If I want to add, update or delete node in the xml using c#,

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If I want to add, update or delete node in the xml using c#, how can it be done? My xml is shown below. I dont want transactionID node. I want to add a node called <Transformation>XML</Transformation> after corelationID node.

<?xml version="1.0" ?>
<GovTalkMessage xmlns="http://www.govtalk.gov.uk/CM/envelope">
    <EnvelopeVersion>2.0</EnvelopeVersion>
    <Header>
        <MessageDetails>
            <Class>HMRC-VAT-DEC</Class>
            <Qualifier>poll</Qualifier>
            <Function>submit</Function>
            <TransactionID />
            <CorrelationID>1B93D48C02D740C6B79DE68A27F3ADE5</CorrelationID>
            <ResponseEndPoint PollInterval="10">https://secure.dev.gateway.gov.uk/poll</ResponseEndPoint>
            <GatewayTimestamp>2011-04-05T07:41:43.018</GatewayTimestamp>
        </MessageDetails>
        <SenderDetails />
    </Header>
    <GovTalkDetails>
        <Keys />
    </GovTalkDetails>
    <Body />
</GovTalkMessage>
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1 Answer

  1. Editorial Team
    //Load the XML
    XmlDocument documentXML = new XmlDocument();
    documentXML.Load(Server.MapPath("AddDeleteUpdate.xml"));

    XmlNamespaceManager xmlns = new XmlNamespaceManager(documentXML.NameTable);
    xmlns.AddNamespace("bk", "http://www.govtalk.gov.uk/CM/envelope");

    //Identify the parent node i.e <MessageDetails>
    XmlNode nodeMessage = documentXML.SelectSingleNode("//bk:GovTalkMessage/bk:Header/bk:MessageDetails", xmlns);

    //Delete the node.
    XmlNode nodeTransactionID = documentXML.SelectSingleNode("//bk:GovTalkMessage/bk:Header/bk:MessageDetails/bk:TransactionID", xmlns);
    nodeMessage.RemoveChild(nodeTransactionID);

    //Create the new XML noded to be added.
    XmlNode controlAttrNode = null;
    controlAttrNode = documentXML.CreateElement("Transformation");
    controlAttrNode.InnerText = "XML";
    controlAttrNode.Attributes.RemoveAll();

    //Get the node object to where it need to be added.
    XmlNode nodeCorrelation = documentXML.SelectSingleNode("//bk:GovTalkMessage/bk:Header/bk:MessageDetails/bk:CorrelationID", xmlns);
    //Insert the node after.
    nodeMessage.InsertAfter(controlAttrNode, nodeCorrelation);

    documentXML.Save(Server.MapPath("AddDeleteUpdate.xml"));
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