xmlserializer problem

I am new to XMLSerializer and am trying to deserialize a very very simple xml file.
Problem is that it fails with error:
line 6, pos 5: Unknown Node:strItemName

Can anyone tell me whats wrong with my readPo() code?
Thank you

1. <?xml version="1.0" encoding="us-ascii" standalone="yes"?>
2. <?xml-stylesheet version='1.0'?>
3. <ItemList>
4. <Item>
5. <strItemName>in 1</strItemName>
6. </Item>
7. <Item>
8. <strItemName>in 2</strItemName>
9. </Item>
10. </ItemList>

read it into code:

// ret true if read ok else false if error
private static bool bReadPO ( string filename, ref ItemList MyItemList )
{
m_bGotXmlSerializeError = false; // init
XmlSerializer serializer = new XmlSerializer ( typeof ( ItemList ) );

/* If the XML document has been altered with unknown
nodes or attributes, handle them with the
UnknownNode and UnknownAttribute events.*/

serializer.UnknownNode += new XmlNodeEventHandler ( serializer_UnknownNode );
serializer.UnknownAttribute += new XmlAttributeEventHandler ( serializer_UnknownAttribute );

// A FileStream is needed to read the XML document.

FileStream fs = new FileStream ( filename, FileMode.Open );

MyItemList = (ItemList) serializer.Deserialize ( fs );

return ( !m_bGotXmlSerializeError );
}

private static void serializer_UnknownNode ( object sender, XmlNodeEventArgs e )
{
if ( m_bGotXmlSerializeError == false ) {

Debug.WriteLine ( "line " + e.LineNumber + ", pos " + e.LinePosition + ": Unknown Node:" + e.Name + "\t" + e.Text );
Console.WriteLine ( "line " + e.LineNumber + ", pos " + e.LinePosition + ": Unknown Node:" + e.Name + "\t" + e.Text );

m_bGotXmlSerializeError = true;

} else {
// already got error
;
}

return;
}

private static void serializer_UnknownAttribute (object sender, XmlAttributeEventArgs e )
{
System.Xml.XmlAttribute attr = e.Attr;

if ( m_bGotXmlSerializeError == false ) {

Debug.WriteLine ( "line " + e.LineNumber + ", pos " + e.LinePosition + ": Unknown attribute " + attr.Name + "='" + attr.Value + "'");
Console.WriteLine ( "line " + e.LineNumber + ", pos " + e.LinePosition + ": Unknown attribute " + attr.Name + "='" + attr.Value + "'");

m_bGotXmlSerializeError = true;

} else {
// already got error
;
}

return;
}