>Sure, but still it isn´t clear for me... I´m just giving my first steps onto VS.NET, and I don´t know where to find and how to use those classes...
>

Claudio,

Check the System.Web.UI.WebControls namespace and the XML Web Server Control.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbconXMLWebServerControl.asp
It will output plain Xml or you can transform it with XSLT.