c# Linq XML - Why Is Whitespace Being Added to Elements With Quotes / Namespace?

Question

A portion of my c# .NET program contains code to modify elements within an XML document. The code works fine in terms of modifying the values based on the variables I'm setting elsewhere in the code, but the problem is that whitespace is being added to all of the the elements when the xml file is saved with the updates.

I am not accessing this element at all in my code. I am assuming that it's because of the quotation marks for the algorithm namespace value, because I can't see any other reason why this would happen. I am using Preserve Namespace on load, and Disable Formatting on save.

So question is, why is it adding this extra whitespace, and how can I stop it?

XML (Source File)

<?xml version="1.0" encoding="UTF-8"?>
<PackingList xmlns="http://www.smpte-ra.org/schemas/2067-2/2016/PKL">
<Id>urn:uuid:296a656c-3610-4de1-9b08-2aa63245788d</Id>
<AnnotationText>JOT_Sample</AnnotationText>
<IssueDate>2018-02-16T20:59:42-00:00</IssueDate>
<Issuer>Generic</Issuer>
<Creator>Generic</Creator>
<AssetList>
  <Asset>
    <Id>urn:uuid:744f36b7-fc7e-4179-8b75-c71c18f98156</Id>
    <AnnotationText>Video_744f36b7-fc7e-4179-8b75-c71c18f98156.mxf</AnnotationText>
    <Hash>8HhnKnLn+Lp/Ik9i94Ml4SXAxH4=</Hash>
    <Size>14568486</Size>
    <Type>application/mxf</Type>
    <OriginalFileName>Video_744f36b7-fc7e-4179-8b75-c71c18f98156.mxf</OriginalFileName>
    <HashAlgorithm Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
  </Asset>
  <Asset>
    <Id>urn:uuid:bf5438ea-ba58-4ae0-a64a-5d23cee2ebb3</Id>
    <AnnotationText>Audio_bf5438ea-ba58-4ae0-a64a-5d23cee2ebb3.mxf</AnnotationText>
    <Hash>Wg4aEAE5Ji9e14ZyGkvfUUjBwCw=</Hash>
    <Size>4341294</Size>
    <Type>application/mxf</Type>
    <OriginalFileName>Audio_bf5438ea-ba58-4ae0-a64a-5d23cee2ebb3.mxf</OriginalFileName>
    <HashAlgorithm Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
  </Asset>
</AssetList>
</PackingList>

XML (Output File)

<?xml version="1.0" encoding="UTF-8"?>
<PackingList xmlns="http://www.smpte-ra.org/schemas/2067-2/2016/PKL">
<Id>urn:uuid:296a656c-3610-4de1-9b08-2aa63245788d</Id>
<AnnotationText>JOT_Sample</AnnotationText>
<IssueDate>2018-02-16T20:59:42-00:00</IssueDate>
<Issuer>Generic</Issuer>
<Creator>Generic</Creator>
<AssetList>
  <Asset>
    <Id>urn:uuid:744f36b7-fc7e-4179-8b75-c71c18f98156</Id>
    <AnnotationText>Video_744f36b7-fc7e-4179-8b75-c71c18f98156.mxf</AnnotationText>
    <Hash>8HhnKnLn+Lp/Ik9i94Ml4SXAxH4=</Hash>
    <Size>14568486</Size>
    <Type>application/mxf</Type>
    <OriginalFileName>Video_744f36b7-fc7e-4179-8b75-c71c18f98156.mxf</OriginalFileName>
    <HashAlgorithm Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
  </Asset>
  <Asset>
    <Id>urn:uuid:bf5438ea-ba58-4ae0-a64a-5d23cee2ebb3</Id>
    <AnnotationText>Audio_bf5438ea-ba58-4ae0-a64a-5d23cee2ebb3.mxf</AnnotationText>
    <Hash>Wg4aEAE5Ji9e14ZyGkvfUUjBwCw=</Hash>
    <Size>4341294</Size>
    <Type>application/mxf</Type>
    <OriginalFileName>Audio_bf5438ea-ba58-4ae0-a64a-5d23cee2ebb3.mxf</OriginalFileName>
    <HashAlgorithm Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
  </Asset>
</AssetList>
</PackingList>

Code (partial):

XDocument pkldoc = XDocument.Load(packing, LoadOptions.PreserveWhitespace);

var pklns = pkldoc.Root.GetDefaultNamespace();

var pkluuid = pkldoc.Descendants(pklns + "Id").FirstOrDefault().Value; 

var pklassetElements = pkldoc.Descendants(pklns + "Asset");

foreach (var pklasset in pklassetElements)
{
    var idElement = pklasset.Descendants(pklns + "Id").First();
    if (!idElement.Value.Equals(cpluuid))
                        continue;

    SetNewValue(pklasset, pklns + "OriginalFileName", outfile);

}
void SetNewValue(XElement currentElement, XName elementName, string newValue)
{
    var matchingElements = currentElement.Descendants(elementName);

    if (matchingElements.Any())
         {
         foreach (var element in matchingElements)
                            element.SetValue(newValue);
         }
    }

pkldoc.Save(packing, SaveOptions.DisableFormatting);
FileInfo fi = new FileInfo(packing);
var pklsize = fi.Length;

Answer 1

This works, though not very clean on my part.

string text = File.ReadAllText(packing);
text = text.Replace(" />", "/>");
File.WriteAllText(packing, text);

UPDATE

This is the solution. Thanks you @asherber !

var textToSave = pkldoc.ToString(SaveOptions.DisableFormatting).Replace(" />", "/>"); 
File.WriteAllText(packing, textToSave);