Transforms XML files e.g. Web.Release.config to Web.config

TransformXml.ps1

param(
    [string] $SourceFile, 
    [string] $TargetFile
)
if (!$SourceFile -or !(Test-Path -path $SourceFile -PathType Leaf)) {
    throw "File not found. $xml";
}
if (!$TargetFile -or !(Test-Path -path $TargetFile -PathType Leaf)) {
    throw "File not found. $TargetFile";
}

Add-Type -LiteralPath "Microsoft.Web.XmlTransform.dll"

$xmldoc = New-Object Microsoft.Web.XmlTransform.XmlTransformableDocument;
$xmldoc.PreserveWhitespace = $true
$xmldoc.Load($SourceFile);

$transf = New-Object Microsoft.Web.XmlTransform.XmlTransformation($TargetFile);
if ($transf.Apply($xmldoc) -eq $false)
{
    throw "Transformation failed."
}
$xmldoc.Save($SourceFile);