using System;

using System.Collections.Generic;

using System.Linq;

using System.Xml.Linq;

​

public class Folders

{

    public static IEnumerable<string> FolderNames(string xml, char startingLetter)

    {

        List<string> res = new List<string>();

        XElement doc = XElement.Parse(xml);

        //if (startingLetter.ToString().Equals(doc.Attribute("name").Value))

        //{

            var query =

                from x in doc.DescendantNodes()select x;

            foreach (XElement item in query)

            {

                var itemName = item.Attribute("name").Value;

                if (itemName.StartsWith(startingLetter.ToString()))

                {

                    res.Add(itemName);

                }

            }

        //}

​

        return res;

    }

​

    public static void Main(string[] args)

    {

        string xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + "<folder name=\"c\">" + "<folder name=\"program files\">" + "<folder name=\"uninstall information\" />" + "</folder>" + "<folder name=\"users\" />" + "</folder>";

        foreach (string name in Folders.FolderNames(xml, 'u'))

            Console.WriteLine(name);

    }

}