how to reference xsd file from xml

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C#

XML

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<!-- Externals changed by QTAssistant (http://www.paschidev.com) -->

<!--
  This is a draft schema for the XML language defined in the 
  Pronunciation Lexicon Specification 
  (latest version at <http://www.w3.org/TR/pronunciation-lexicon/>)
  At the time of writing, the specification as well as this schema are
  subject to change, and no guarantee is made on their accuracy or the fact
  that they are in sync.
  Last modified: $Date: 2007/12/11 12:08:40 $

  Copyright û 2006 World Wide Web Consortium, (Massachusetts Institute
  of Technology, ERCIM, Keio University). All Rights Reserved. See
        http://www.w3.org/Consortium/Legal/.
-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:p="http://www.w3.org/2005/01/pronunciation-lexicon" targetNamespace="http://www.w3.org/2005/01/pronunciation-lexicon" elementFormDefault="qualified" version="1.0">
    <xs:annotation>
        <xs:documentation>Importing dependent namespaces</xs:documentation>
    </xs:annotation>
    <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="xml.xsd" />

 ...
    </xs:schema>

<?xml version="1.0" encoding="utf-8"?> 
<lexicon version="1.0" 
    xmlns="http://www.w3.org/2005/01/pronunciation-lexicon" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3.org/2005/01/pronunciation-lexicon file://C:/some/folder/where/your/xsd/file/is/pls.xsd" 
    alphabet="x-microsoft-ups" xml:lang="en-IN">
    <lexeme>

    </lexeme>
</lexicon>

i have above two codes these giving me errors in both xmls
error has occurred while opening external DTD 'file:///C:/xsdforproject/XMLSchema.dtd': Could not find file 'C:\xsdforproject\XMLSchema.dtd
i am using VS2010