XML document Creation using xml writer. Please help its urgent

[C# Programming]

xmlDoc = new XmlDocument(); using (XmlWriter xmlWriter = xmlDoc.CreateNavigator().AppendChild()) { xmlWriter.WriteStartDocument(); xmlWriter.WriteStartElement("INTERACTIONS", xmlns); xmlWriter.WriteStartElement("CALL_STATUS"); xmlWriter.WriteString("open"); xmlWriter.WriteEndElement(); xmlWriter.WriteStartElement("ARE_DOCS_REQUIRED"); xmlWriter.WriteString("No"); xmlWriter.WriteEndElement();
string ipxml = ThomasAlwa Edison
xmlWriter.WriteStartElement("MY_COMPLAINT"); xmlWriter.WriteString("ipxml"); xmlWriter.WriteEndElement();
xmlWriter.WriteEndDocument(); } xmlDoc.InnerXml.ToString();

I have created an xml document using xmlWriter and having xmlelement
my problem is XML element 'MY_COMPLAINT' contains another XML which is 'ipxml', when the xml file is created MY_COMPLAINT element contains ipxml as a string but i want it has to be its Child element

how can i convert ipxml string to be as child node of MY_COMPLAINT
as xmlwriter.WriteString accepts parameters as a string.

Help me out.

Thanks in advanced..