How to add a new XML node to file

Need to open an XML file and add a node?

Here's how:

Sample XML file:

<?xml version="1.0"?>
<HelpData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<helpButtonUrls>
<HelpButtonUrl>
<buttonName>BugReport</buttonName>
<url>C:\BugRep.exe</url>
</HelpButtonUrl>
</helpButtonUrls>
</HelpData>

We want to add another HelpButtonNode:

private void AddNodeToXMLFile(string XmlFilePath, string NodeNameToAddTo)
{
    //create new instance of XmlDocument
    XmlDocument doc = new XmlDocument();

    //load from file
    doc.Load(XmlFilePath);

    //create main node
    XmlNode node = doc.CreateNode(XmlNodeType.Element, "HelpButtonUrl", null);

    //create the nodes first child
    XmlNode ButtonName = doc.CreateElement("buttonName");
    //set the value
    ButtonName.InnerText = "Video Help";

    //create the nodes second child
    XmlNode url = doc.CreateElement("url");
    //set the value
    url.InnerText = "D:\\RunHelp.exe";

    // add childes to father
    node.AppendChild(ButtonName);
    node.AppendChild(url);

    // find the node we want to add the new node to
    XmlNodeList l = doc.GetElementsByTagName(NodeNameToAddTo);
    // append the new node
    l[0].AppendChild(node);
    // save the file
    doc.Save(XmlFilePath);
}

XML file after:

<?xml version="1.0"?>
<HelpData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <helpButtonUrls>
    <HelpButtonUrl>
      <buttonName>BugReport</buttonName>
      <url>C:\BugRep.exe</url>
    </HelpButtonUrl>
    <HelpButtonUrl>
      <buttonName>Video Help</buttonName>
      <url>D:\RunHelp.exe</url>
    </HelpButtonUrl>
  </helpButtonUrls>
</HelpData>

And thats all there is to it!