How to modify existing XML file with xmldocument and xmlnode in C# WPF

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C#

XML

WPF

I have got problems to update a XML Document. I am not getting the Selected attribute value.And know I don't know how to update the childNode id value with XmlDocument & XmlNode.

Is there some property to update for the selectedAttibute value? Please some one please help me on this. I have tried the below code.

What I have tried:

This is Languages.xml

<?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>Chines</Name>
		<CULTURE>zh-CN</CULTURE>
    <Selected>Y</Selected>
	</LANGUAGE>
</LANGUAGES>

And also I have tried like this but I am getting selectedAttribute value as null.

private void OnSelectedLanguageChanged(Model.Language selectedLanguage)
       {

           XmlDocument doc = new XmlDocument();
           doc.Load("Languages.xml");

           XmlNodeList aNodes = doc.SelectNodes("/LANGUAGES/LANGUAGE");
           // loop through all nodes
           foreach (XmlNode aNode in aNodes)
           {

               XmlAttribute selectedAttribute = aNode.Attributes["Selected"];

               // check if that attribute even exists...
               if (selectedAttribute != null)
               {
                   // if yes - read its current value
                   string currentValue = selectedAttribute.Value;


                   if (!string.IsNullOrEmpty(currentValue))
                   {
                       selectedAttribute.Value = "N";
                   }
               }
           }
           doc.Save(@"Languages.xml");
       }