Change the node names in an XML file using C#

(1.) The [XmlElement / XmlNode].Name property is read-only.

(2.) The XML structure used in the question is crude and could be improved.

(3.) Regardless, here is a code solution to the given question:

String sampleXml =
  "<doc>"+
    "<Stuff1>"+
      "<Content>someContent</Content>"+
      "<type>someType</type>"+
    "</Stuff1>"+
    "<Stuff2>"+
      "<Content>someContent</Content>"+
      "<type>someType</type>"+
    "</Stuff2>"+
    "<Stuff3>"+
      "<Content>someContent</Content>"+
      "<type>someType</type>"+
    "</Stuff3>"+
  "</doc>";

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(sampleXml);

XmlNodeList stuffNodeList = xmlDoc.SelectNodes("//*[starts-with(name(), 'Stuff')]");

foreach (XmlNode stuffNode in stuffNodeList)
{
    // get existing 'Content' node
    XmlNode contentNode = stuffNode.SelectSingleNode("Content");

    // create new (renamed) Content node
    XmlNode newNode = xmlDoc.CreateElement(contentNode.Name + stuffNode.Name);

    // [if needed] copy existing Content children
    //newNode.InnerXml = stuffNode.InnerXml;

    // replace existing Content node with newly renamed Content node
    stuffNode.InsertBefore(newNode, contentNode);
    stuffNode.RemoveChild(contentNode);
}

//xmlDoc.Save

PS: I came here looking for a nicer way of renaming a node/element; I'm still looking.

The easiest way I found to rename a node is:

xmlNode.InnerXmL = newNode.InnerXml.Replace("OldName>", "NewName>")

Don't include the opening < to ensure that the closing </OldName> tag is renamed as well.