.SelectSingleNode in Powershell script using xPath not working on extracting values from web.config file

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Your XML file has a namespace:

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">

so you need a namespace manager for SelectSingleNode (see section “Remarks”):

XPath expressions can include namespaces. Namespace resolution is supported using the XmlNamespaceManager. If the XPath expression includes a prefix, the prefix and namespace URI pair must be added to the XmlNamespaceManager.

Something like this should work:

$ns = New-Object System.Xml.XmlNamespaceManager($WebConfigXml.NameTable)
$ns.AddNamespace("ns", $WebConfigXml.DocumentElement.NamespaceURI)
$node = $WebConfigXml.SelectSingleNode("//ns:add[@key='SiteDomain']", $ns)

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