C#: Adding elements to XML file

Using XML Linq  how do I add a new  TV show to the attached XML TV.xml preferable so the show.names are in alphabetical order?

From MyForm I call Thus

xmlFuncs.AddShowName(ShowName, FolderName, TMDBid, Xdoc);

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or

xmlFuncs.AddShowName("Charmed", "Charmed 2018" "79611", Xdoc);

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this creates

NewShow = {<Show>
  <Name>Charmed</Name>
  <FolderName>Charmed 2018</FolderName>
  <TMDBid>79611</TMDBid>
</Show>}

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Xml.Linq;

namespace TVDB
{
    class XMLFuncs
    {
        public XDocument Xdoc;


        public XDocument LoadXML(string XMLpath)
        {
            if (File.Exists(XMLpath))
            {
                Xdoc = XDocument.Load(XMLpath);
                return Xdoc;

            }
            else
            {
                return null;
            }
        }
        public string ChecKShowName(string FolderName, XDocument Xdoc)
        {

            // // Checks for the existence of a Show and return it's TMDB ID
            var results = (from node in Xdoc.Descendants("Show")
                           where node.Element("FolderName").Value == FolderName
                           select node.Element("TMDBid").Value).FirstOrDefault();
            if (results != null)
            {
                return results;
            }
            else
            {
                return null;
            }

        }
        internal void AddShowName(string Name, string FolderName, string TMDBid, XDocument Xdoc)
        {
            var NewShow = new XElement("Show",
                new XElement("Name", Name),
                new XElement("FolderName", FolderName),
                new XElement("TMDBid", TMDBid)
                );
            var show = (from node in Xdoc.Descendants("Show")
                        where node.Element("FolderName").Value == FolderName
                        select node).FirstOrDefault();

// form crashes after here with no errors

            if (show == null)
            {
                show.Add(NewShow);
                // Save the document with the new Show
                Xdoc.Save(@"J:\Media\TV\TVNew.xml");
            }

        }


    }// end class XMLFuncs
}

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