How to add child element after Root element

Question

I've the following function, that I can pass my C# object to which can then convert it to Xml.

public static XmlDocument SerializeObjectToXML(object obj)
{
  XmlSerializer serializer = 
      new XmlSerializer(obj.GetType());

  using (MemoryStream ms = new MemoryStream())
  {
     XmlDocument xmlDoc = new XmlDocument();
     serializer.Serialize(ms, obj);
     ms.Position = 0;
     xmlDoc.Load(ms);
  }
}

However, I need to add a Child Element after the Root. For example at the moment I have

<MyObjectResponse>
    <Id>1</Id>
    <Name>Mr Smith</Name>
    <Numbers>
      <Number>100</Number>
      <Number>200</Number>
    </Numbers>
</MyObjectResponse>

But want the output to

<MyObjectResponse>
  <Response>
    <Id>1</Id>
    <Name>Mr Smith</Name>
    <Numbers>
      <Number>100</Number>
      <Number>200</Number>
    </Numbers>
  </Response>
</MyObjectResponse>

How can I achieve this ?

Answer 1

Something like this should do the trick:

XmlDocument xmlDoc = new XmlDocument();
serializer.Serialize(ms, obj);
ms.Position = 0;
xmlDoc.Load(ms);

XmlElement newElem = xmlDoc.CreateElement("Response");

//wrong: works for only 1 child element
//kept for edit/reference
//foreach (XmlNode item in xmlDoc.DocumentElement.ChildNodes)
//{
//    newElem.AppendChild(item);
//}

while (xmlDoc.DocumentElement.ChildNodes.Count != 0)
{
    newElem.AppendChild(xmlDoc.DocumentElement.ChildNodes[0]);
}

xmlDoc.DocumentElement.AppendChild(newElem);

EDIT replaced the foreach loop with a correct and general implementation using a while loop.