using System;

using System.Linq;

using System.Xml;

using System.Xml.Linq;

​

public class Program

{

    public static void Main(string[] args)

    {

        const string xml = @"<itema>

   <itemb FunName=""ABC"" isEnable=""true""></itemb>

   <itemb FunName=""DEF"" isEnable=""false""></itemb>

</itema>";

​

        var doc = XDocument.Parse(xml);

​

        Console.WriteLine("ABC: {0}", IsEnabled(doc, "ABC"));

        Console.WriteLine("DEF: {0}", IsEnabled(doc, "DEF"));

    }

​

    private static bool IsEnabled(XDocument doc, string funName)

    {

        return doc.Descendants("itemb")

            .Where(e => (string) e.Attribute("FunName") == funName)

            .Select(e => (bool) e.Attribute("isEnable"))

            .Single();

    }

}

​

​

​