How to update XML as per the combobox selection in WPF.

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C#

XML

WPF

MVVM

I have developed a test application. The application contain one comboBox and one XML file. XML vale is getting bind with the ComboBox. Here I need to update the xml As per the selection in the ComboBox. There is an element in XML i.e <selected>Y.If the language is selected to English. Then the <selected> property should be Y for the selected language and for rest all languages the <selected> property should be 'N' ex: <selected>N. Below code I have tried . Some one please help me on this.

What I have tried:

This is GeneralViewModel.cs

public IReadOnlyList<Model.Language> languages { get; } = LoadLanguages();
private static IReadOnlyList<Model.Language> LoadLanguages()
{
    XDocument doc = XDocument.Load("Languages.xml");
    return doc.Root.Elements("LANGUAGE").Select(el => new Model.Language(el)).ToList();
}
private Model.Language _selectedlanguage;
public Model.Language selectedlanguage
{
    get { return _selectedlanguage; }
    set
    {
        if (value != _selectedlanguage)
        {
            _selectedlanguage = value;
            RaisePropertyChanged(nameof(selectedlanguage));
        }
    }
}

This is the GeneralView.xaml

<ComboBox x:Name="cmName" Grid.Row="2" Grid.Column="1" Height="30" Width="150" ItemsSource="{Binding Path=languages}" SelectedValue="{Binding Path=selectedlanguage}" DisplayMemberPath="Name"/>

This is Languages.cs

namespace Clearcore2.VerticalApplications.Settings.Model
{
public class Language
    {
        public Language(XElement element)
        {
            Name = (string)element.Element("Name");
            CultureCode = (string)element.Element("CULTURE");
            Selected = (string)element.Element("Selected");
        }
        public string Name { get; set; }
        public string CultureCode { get; set; }
        public string Selected { get; set; }
    }
}

And This is Languages.xml(So here if we select English in the comboBox,Except English rest for all languages selected value should be 'N' i.e <selected>N)

<?xml version="1.0" encoding="utf-8" ?>
<LANGUAGES>
  <LANGUAGE>
    <Name>English</Name>
    <Culture>en-US</Culture>
    <Selected>Y</Selected>
  </LANGUAGE>
  <LANGUAGE>
    <Name>German</Name>
    <Culture>de-DE</Culture>
    <Selected>Y</Selected>
  </LANGUAGE>
  <LANGUAGE>
    <Name>Chinesh (Simplified)</Name>
    <Culture>zh-CN</Culture>
    <Selected>Y</Selected>
  </LANGUAGE>
  <LANGUAGE>
    <Name>Spanish</Name>
    <Culture>es-ES</Culture>
    <Selected>Y</Selected>
  </LANGUAGE>
</LANGUAGES>