XML : How to edit a file in IsolatedStorage C#

I have been fiddling with this problem for the past hour so I thought you guys may be able to help on a Friday afternoon!

Problem

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I am trying to edit an XML file in localstorage but can't figure out how to edit the existing file and re-save the file. The edit I have made it to remove a certain node from the XML.

Code

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Here is the method that does all the work.

This first code snippet was already in the code and basically creates the XML file and saves it to localstorage.:

  protected byte[] CreateFileData(PortableBusinessObjects.Location location, string geoObjectFilename)  {      byte[] fileData = null;      var xmlFile = System.IO.Path.GetFileNameWithoutExtension(geoObjectFilename) + ".xml";      var zipFile = System.IO.Path.GetFileNameWithoutExtension(geoObjectFilename) + ".zip";          using (IsolatedStorageFileStream fileStream = localStorage.CreateFile(xmlFile))      {                  XmlWriter writer = XmlWriter.Create(fileStream);                  if (location.GetType() == typeof(PortableBusinessObjects.Shape))                      _xmlShapeSerializer.Serialize(writer, location);                  else if (location.GetType() == typeof(PortableBusinessObjects.Point))                      _xmlPointSerializer.Serialize(writer, location);                  fileStream.Flush();                  fileStream.Close();      }                   }    

This is my attempt at overwriting the saved file (Doesn't work):

  using (IsolatedStorageFileStream doc = localStorage.OpenFile(xmlFile, FileMode.Open))  {        System.Xml.Linq.XDocument test = System.Xml.Linq.XDocument.Load(doc);      test.Descendants("Time").Remove();         XmlWriter writer = XmlWriter.Create(doc);           doc.Flush();       doc.Close();  }    

Question

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Where do I place my code that removes the "Time" nodes and saves the file?