How to get the child nodes value in perticular XML parent node in C#?

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C#

XML

WPF

Hi,
I hace xml file Folders.xml,

<root>
<Folder name="Planning">
  <subfolder name="Meeting Minuts"/>
  <subfolder name="Weekly Report"/>
  <subfolder name="Monthaly Report"/>
  <subfolder name="Design Image"/>
</Folder>
<Folder name="Engineering">
  <subfolder name="Engineering1"/>
  <subfolder name="Engineering2"/>
  <subfolder name="Engineering3"/>
  <subfolder name="Engineering4"/>
</Folder>
<Folder name="Quality">
  <subfolder name="Quality1"/>
  <subfolder name="Quality2"/>
  <subfolder name="Quality3"/>
  <subfolder name="Quality4"/>
</Folder>
</root>

Planing, Engineering and quality are the combobox element. When user will select combobox as Planing the i need to dispaly all the subfolder in the planning, if he will select Quality then all the subfolder should display,

How can I get subelement of perticular parent,

What I have tried:

here is the code to get Parent element.

XDocument myxml = XDocument.Load(@"Xml\Folders.xml");
            string str = string.Empty;
            foreach (XElement level1Element in XElement.Load(@"Xml\Folders.xml").Elements("Folder"))
            {
                str=(level1Element.Attribute("name").Value);
                Folders.Add(str);
            }
            cmb1.ItemsSource = Folders;