This is when using XDocument from .net.
I thought this might work...
xElement.Element(elementName).Value = new XCData(value).ToString();
... but it comes out like this...
<name><![CDATA[hello world]]></name>
XCData is a type of XNode. As such, you should try to Add it to the element, rather than set the value (which is documented to be the flattened text content of the element):
xElement.Element(elementName).Add(new XCData(value));