Problem with ValidationEventHandler

Hi
I've got a xml file and xsd with only one namespace -
xmlns:media="http://search.yahoo.com/mrss". When I'm getting the rss
feed for example from Youtube there're also others namespaces such as
xmlns:atom or xmlns:yt. When I'm trying to validate this Xml with my
xsd the validationeventhandler show me only the first error. But what
when we got xml file like:
>
<channel>
<atom:idIdent </atom:id>
<atom:nameName </atom:name>
....
</channel>
>
The Validator show me the atom:id is not in my xsd file but there's
nothing about next wrong items such as atom:name.
What should I do to change this to show me all the errors??

It's something about this:
>
protected void Page_Load(object sender, EventArgs e)
{
XmlSchemaSet set = new XmlSchemaSet();
set.Add(null, Server.MapPath("rss.xsd"));
set.Add(null, Server.MapPath("mediarss.xsd"));
XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationType = ValidationType.Schema;
settings.Schemas = set;
settings.ValidationEventHandler += new
ValidationEventHandler(settings_ValidationEventHan dler);
settings.ValidationFlags |=
XmlSchemaValidationFlags.ReportValidationWarnings;
StreamReader sreader = new
StreamReader(Server.MapPath("file.xml"));
XmlReader xreader = XmlReader.Create(sreader, settings);
while (xreader.Read()) { }
}
>
void settings_ValidationEventHandler(object sender,
ValidationEventArgs e)
{
Response.Write(e.Message + "\r\n");
}