XmlDocument Save keeps file open

I have a simple c# function that creates a basic XML file and saves:

private void CreateXMlFile(string Filename, string Name, string Company)
        {
            XmlDocument doc = new XmlDocument();
            XmlNode docNode = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
            doc.AppendChild(docNode);

            XmlNode licenseNode = doc.CreateElement("license");
            doc.AppendChild(licenseNode);

            XmlNode node = doc.CreateElement("Name");
            node.AppendChild(doc.CreateTextNode(Name));
            licenseNode.AppendChild(node);

            node = doc.CreateElement("Company");
            node.AppendChild(doc.CreateTextNode(Company));
            licenseNode.AppendChild(node);


            doc.Save(Filename);
        }

When I try to edit or delete the file I always get following error:

The process cannot access the file because it is being used by another process.

XmlDocument doesnt have any inbuilt dispose or close routines and wondered how I can force the file to close before later editing or deleting it.

I have tried to save the file using StreamWriter:

StreamWriter outStream = System.IO.File.CreateText(outfile);
            outStream.Write(data);
            outStream.Close();

But this didnt make a difference with the same error.

Your advice is greatly accepted.

Thank you