adding xmlElements in a stream XmlTextWriter..

Hi,
I have a list of objects that have a ToXML() method (not yet determine what
type I have to do it).

I want to add each of their XML representantive to a the while XML file
being build in as a stream one with XmlTextWriter,

in other words I would like to do something like

foreach(MyObject obj in MyList)
{
myWholeList.addNode(obj.ToXML());
}

Any tip will very much appreciated.

Thank You.