XML Validation Errors when validating against xsd schema - code example supplied

I am trying to validate my xml against an xsd file. The code below works fine but the errors it reports seem to indicate there is something wrong with the reference to the xsd file. It cannot find the xsd file.

Imports System
Imports System.Collections.Generic
Imports System.Xml
Imports System.Xml.Schema

Public Class XmlValidator
    ''' <summary>
    ''' Get any error messages that were found validating the XML document against
    ''' an XSD schema document.
    ''' </summary>
    Public ReadOnly Property ValidationErrors() As List(Of String)
        Get
            Return _validationErrors
        End Get
    End Property

    Public Sub ValidateXmlAgainstSchema(ByVal xmlFileName As String, ByVal xsdFileName As String)
        Using xsdReader As XmlReader = XmlReader.Create(xsdFileName)
            ' Read the schema from a file.
            Dim schema As XmlSchema = XmlSchema.Read(xsdReader, AddressOf OnValidationEvent)

            ' Setup the XmlReader for schema validation.
            Dim settings As New XmlReaderSettings()
            settings.ValidationType = ValidationType.Schema
            settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings

            AddHandler settings.ValidationEventHandler, AddressOf OnValidationEvent

            ' Add the schema document.
            settings.Schemas.Add(schema)

            ' Read each element of the document. Any errors will raise a ValidationEvent.
            Using reader As XmlReader = XmlReader.Create(xmlFileName, settings)
                While reader.Read()
                End While
            End Using
        End Using
    End Sub

    Private Sub OnValidationEvent(ByVal sender As Object, ByVal e As ValidationEventArgs)
        _validationErrors.Add(e.Message)
    End Sub

    Private _validationErrors As New List(Of String)()

End Class


Here is an XML sample
<?xml version="1.0" encoding="utf-8"?>
<RootNode>
  <SubNode>
    <SomeItem1>Some Item One</SomeItem1>
    <SomeItem2>Some Item Two</SomeItem2>
    <SomeErrorItem>This should not be here!!</SomeErrorItem>
  </SubNode>
</RootNode>

and equivalent xsd file

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="TestSchema" targetNamespace="http://tempuri.org/TestSchema.xsd" elementFormDefault="qualified" xmlns="http://tempuri.org/TestSchema.xsd" xmlns:mstns="http://tempuri.org/TestSchema.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="RootNode">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="SubNode">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="SomeItem1" type="xs:string" />
              <xs:element name="SomeItem2" type="xs:string" />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

Can someone tell me what is wrong. What else do I have to do to validate the xml. I would expect one error back due to the extra error field added but instead i get a list of error saying it could not find xsd file for any of the xml nodes.

Cheers

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