XmlDocumento to string c#

Hi everyone, can help me, I have a xml document, y use the load function and I working whit it, and after i need the string of this XmlDocument, I use OuterXML function but in my string I obtain this:

"<?xml version=\"1.0\" encoding=\"UTF-8\"?>"

but i need a string whit this:

<?xml version="1.0" encoding="UTF-8"?>

I hope any can halpme

P.D.

Sorry for by bad english :D