using XSD to validate XML

[lfc77]

I have an xml doucument that I want to validate with a XSD schema. I'm new to this and I don't know exactly how I make the references at the top of the documents so that the XSD file will validate the XML file in my C# program. My code is below :

change.xml :

<?xml version=&quot;1.0&quot;?>
<rsp-vcn xmlns:xsi=&quot;

http://www.w3.org/2001/XMLSchema-instance&quot;

xsi:noNamespaceSchemaLocation=&quot;change.xsd&quot;
message_id=&quot;0&quot;>
<auth>
<cug>5745</cug>
<pasw>Password1</pasw>
</auth>
<service type=&quot;change&quot;>
<info>
<number>441173060201</number>
<subcug>1234</subcug>
<pay>card</pay>
<currency>usd</currency>
<language>eng</language>
<cash>20.00</cash>
</info>
</service>
</rsp-vcn>


change.xsd :

<?xml version=&quot;1.0&quot; ?>
<xs:schema xmlns:xs=&quot;

http://www.w3.org/2001/XMLSchema&quot;>

<xs:element name=&quot;rsp-vcn&quot;>
<xs:complexType>
<xs:sequence>
<xs:element name=&quot;auth&quot;>
<xs:complexType>
<xs:sequence>
<xs:element name=&quot;cug&quot; type=&quot;xs:string&quot; />
<xs:element name=&quot;pasw&quot; type=&quot;xs:string&quot; />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name=&quot;service&quot;>
<xs:complexType>
<xs:sequence>
<xs:element name=&quot;info&quot; maxOccurs=&quot;unbounded&quot;>
<xs:complexType>
<xs:sequence>
<xs:element name=&quot;number&quot; type=&quot;xs:string&quot; minOccurs=&quot;1&quot; />
<xs:element name=&quot;subcug&quot; type=&quot;xs:string&quot; minOccurs=&quot;0&quot; />
<xs:element name=&quot;pay&quot; type=&quot;xs:string&quot; minOccurs=&quot;0&quot; />
<xs:element name=&quot;currency&quot; type=&quot;xs:string&quot; minOccurs=&quot;0&quot; />
<xs:element name=&quot;language&quot; type=&quot;xs:string&quot; minOccurs=&quot;0&quot; />
<xs:element name=&quot;cash&quot; type=&quot;xs:string&quot; minOccurs=&quot;0&quot; />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name=&quot;type&quot; use=&quot;required&quot;>
<xs:simpleType>
<xs:restriction base=&quot;string&quot;>
<xs:enumeration value=&quot;change&quot; />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name=&quot;message_id&quot; type=&quot;xs:string&quot; use=&quot;required&quot; />
</xs:complexType>
</xs:element>
</xs:schema>


Any help would be really appreciated.


Cheers,

lfc77