C# - Extract Nodes From String Containing XML?

I am using a web service and get a SOAP envelope back and I am trying to extract some data but constantly run into errors. I have tried with LINQ, using xsl transform and so on.

The response is:

<?xml version="1.0" encoding="utf-8" ?>
- <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">
- <soap:Body>
- <ABRSearchByABNResponse xmlns="some service /">
- <ABRPayloadSearchResults>
- <request>
- <identifierSearchRequest>
<authenticationGUID>some guid</authenticationGUID>
<identifierType>ABN</identifierType>
<identifierValue>54 108 408 566</identifierValue>
<history>N</history>
</identifierSearchRequest>
</request>
- <response>
<usageStatement>some statementusageStatement>
<dateRegisterLastUpdated>2011-01-26</dateRegisterLastUpdated>
<dateTimeRetrieved>2011-01-26T15:14:45.9776800+11:00</dateTimeRetrieved>
- <businessEntity>
<recordLastUpdatedDate>2000-08-26</recordLastUpdatedDate>
- <ABN>
<identifierValue>11111111111</identifierValue>
<isCurrentIndicator>Y</isCurrentIndicator>
<replacedIdentifierValue xsi:nil="true" />
<replacedFrom>0001-01-01</replacedFrom>
</ABN>
- <entityStatus>
<entityStatusCode>Active</entityStatusCode>
<effectiveFrom>2000-06-05</effectiveFrom>
<effectiveTo>0001-01-01</effectiveTo>
</entityStatus>
<ASICNumber />
- <entityType>
<entityTypeCode>IND</entityTypeCode>
<entityDescription>Individual/Sole Trader</entityDescription>
</entityType>
- <goodsAndServicesTax>
<effectiveFrom>2000-07-01</effectiveFrom>
<effectiveTo>0001-01-01</effectiveTo>
</goodsAndServicesTax>
- <legalName>
<givenName>some name</givenName>
<otherGivenName />
<familyName>some name</familyName>
<effectiveFrom>2000-08-26</effectiveFrom>
<effectiveTo>0001-01-01</effectiveTo>
</legalName>
- <mainBusinessPhysicalAddress>
<stateCode>QLD</stateCode>
<postcode>4350</postcode>
<effectiveFrom>2000-08-26</effectiveFrom>
<effectiveTo>0001-01-01</effectiveTo>
</mainBusinessPhysicalAddress>
</businessEntity>
</response>
</ABRPayloadSearchResults>
</ABRSearchByABNResponse>
</soap:Body>
</soap:Envelope>

My xslt file:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl" xmlns:soap="http://soap/Envelope/Body/">
<xsl:output method="html" indent="yes"/>
<xsl:template match="/">

Edit2:

I realized now that I can do:

foreach(var item in ABN)
{
label1.Text += item.identifierValue.ToString();
}