XPathSelectElements doesn't work

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Can anyone please tell me why this xpath select doesn't return anything in visual studio, but it works correctly within xpath visualiser. I'm using visual studio 2012.

var elements = _resultDocument.XPathSelectElements(xPathOfElements, _namespaceManager);

input xml :

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <soap:Body>
    <tns:aggregateQuoteRequest xmlns:tns="http://schemas.cdlis.co.uk/aggregator/api/v3-8">
      <userid>CTM</userid>
      <password>tys82HS63BjS</password>
      <broker results="1">autonet</broker>
      <policyType>GV</policyType>
      <returnNoQuotes>Y</returnNoQuotes>
      <store>true</store>
      <risk xsi:type="tns:goodsVehicleRiskType">
        <policy>
          <inceptionDate>2012-10-16</inceptionDate>
          <frequency>A</frequency>
          <protectedBonus>N</protectedBonus>
          <cover>C</cover>
          <volXS>500</volXS>
          <restrict>IO</restrict>
          <previousInsurance>
            <expiryDate>2012-10-16</expiryDate>
            <yearsHeld>0</yearsHeld>
            <type>CV</type>
            <noClaimsBonusYears>9</noClaimsBonusYears>
            <ncbProtected>N</ncbProtected>
          </previousInsurance>
          <totalMileage>0</totalMileage>
          <classOfUse>O</classOfUse>
        </policy>
        <proposer driverId="1">
          <name>
            <title>MR</title>
            <forenames>Chris</forenames>
            <surname>test</surname>
          </name>
          <gender>M</gender>
          <dateOfBirth>1970-01-01</dateOfBirth>
          <maritalStatus>M</maritalStatus>
          <residentSince>1970-01-01</residentSince>
          <insuranceRefused>N</insuranceRefused>
          <nonRtaConviction>N</nonRtaConviction>
          <fullTimeOccupation>
            <type>E</type>
            <occCode>463</occCode>
            <empCode>432</empCode>
          </fullTimeOccupation>
          <licence>
            <type>F</type>
            <date>1998-08-28</date>
          </licence>
          <vehicleUse>M</vehicleUse>
          <accessToOtherVehicles>NAOV</accessToOtherVehicles>
          <motoringOrg>NONE</motoringOrg>
          <smoker>Y</smoker>
          <address>
            <addressLine1>6 Pasture Grove</addressLine1>
            <addressLine2>Ely</addressLine2>
            <addressLine3></addressLine3>
            <addressLine4></addressLine4>
            <postCode>CB6 3EY</postCode>
            <abodeType>H</abodeType>
          </address>
          <daytimeTelephone>01000 000000</daytimeTelephone>
          <eveningTelephone>01000 000000</eveningTelephone>
          <email>test@test.com</email>
        </proposer>
        <vehicle>
          <regNumber>
              LR57WRL
            </regNumber>
          <abiCode>90301945</abiCode>
          <yearOfManufacture>2008</yearOfManufacture>
          <whereKept>G</whereKept>
          <keeper>Y</keeper>
          <owner>Proposer</owner>
          <purchased>2013-08-28</purchased>
          <value>
              4000
            </value>
          <paid>
              4000
            </paid>
          <vehicleOthers>0</vehicleOthers>
          <LHD>N</LHD>
          <ABS>N</ABS>
          <seats>2</seats>
          <modifications>
            <modified>N</modified>
          </modifications>
          <immob>FF93</immob>
          <alarm>FACT</alarm>
          <tracker>NONE</tracker>
          <radiusLimit>999</radiusLimit>
          <grossWeight>1.72</grossWeight>
        </vehicle>
        <duqs>
          <question number="11">N</question>
          <question number="64">D</question>
          <question number="73">N</question>
          <question number="74">N</question>
          <question number="78">Y</question>
          <question number="135">Y</question>
          <question number="244">Y</question>
          <question number="165">N</question>
          <question number="235">N</question>
          <question number="255">N</question>
          <question number="142">N</question>
          <question number="221">180</question>
          <question number="292">F</question>
          <question number="246">N</question>
          <question number="248">N</question>
          <question number="259">N</question>
          <question number="279">Y</question>
          <question number="295">F</question>
          <question number="282">F</question>
          <question number="527">N</question>
          <question number="675">Y</question>
          <question number="245">E</question>
        </duqs>
      </risk>
    </tns:aggregateQuoteRequest>
  </soap:Body>
</soap:Envelope>