Validating XML schema in C#

Hi,

By calling Dataset.WriteXml, my code produces XML as listed
below.

The user can also load the XML file, and I will use
Dataset.ReadXML to do
this. Preferably before calling that method, I would like to
validate the
schema of the XML to ensure that it has the same structure
as an XML file
produced by WriteXml. How can I do that?

At present, I am loading the XML file and writing code like
this:
                        ValidXml =
                                (LoadedOk) &

(dsKeysAndValues.Tables[dsnKeysAndValues].Columns[KeyGroup]
!= null) &

(dsKeysAndValues.Tables[dsnKeysAndValues].Columns[ValueGroup
] != null) ;
The code not only doesn't work, but it also doesn't seem
elegant - if the
XML file is large, it will take time just to load the file,
before I can
validate it.
How can I validate the schema of XML to ensure that it
matches what I am
expecting?

Thanks for your help, pointers, and time!

Richard
The mystery is out there - in the XML-Files (X-files music
follows.)

XML produced using WriteXml:
<?xml version="1.0"
standalone="yes"?>
<KeysAndValues>
  <xs:schema id="KeysAndValues"
xmlns=""
xmlnss=&qu
ot;http://www.w3.
org/2001/XMLSchema"
xmlns:msdata="urn:schemas-microsoft-comml-ms
data">
    <xs:element name="KeysAndValues"
msdata:IsDataSet="true"
msdata:Locale="en-CA">
      <xs:complexType>
        <xs:choice maxOccurs="unbounded">
          <xs:element name="KeysAndValues">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="Key"
minOccurs="0">
                  <xs:simpleType>
                    <xs:restriction
base="xs:string">
                      <xs:maxLength value="50"
/>
                    </xs:restriction>
                  </xs:simpleType>
                </xs:element>
                <xs:element name="Value"
minOccurs="0">
                  <xs:simpleType>
                    <xs:restriction
base="xs:string">
                      <xs:maxLength value="255"
/>
                    </xs:restriction>
                  </xs:simpleType>
                </xs:element>
              </xs:sequence>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:complexType>
    </xs:element>
  </xs:schema>
  <KeysAndValues>
    <Key>        K1</Key>
    <Value>     V9999</Value>
  </KeysAndValues>

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