using System;

using System.Xml;

using System.Xml.Linq;

using System.Xml.XPath;

public class Program

{

    public static void Main()

    {

        string xml = @"<root>

           <country>

               <name></name>

               <locationOU>null</locationOU>

           </country>

           <country>

               <name>Sweden</name>

               <locationOU>Some Value</locationOU>

           </country>

           <country>

               <name>Lithuania</name>

               <locationOU>Some Value</locationOU>

           </country>

           <country>

               <name>Belgium</name>

               <locationOU>Some Value</locationOU>

           </country>

        </root>";

        XDocument root = XDocument.Parse(xml);

        XElement result = root.XPathSelectElement("/root/country[name='Sweden']");

        Console.WriteLine(result.Element("locationOU").Value);

    }

}