ico.cs

using System;
using System.Net;
using System.Xml;
using System.Linq;

public class Test
{
        public static void Main()
        {
                Console.Write("ICO: ");
                int ico;
                if (!int.TryParse(Console.ReadLine(), out ico))
                        Console.WriteLine("chyba");
                string url = "http://wwwinfo.mfcr.cz/cgi-bin/ares/darv_std.cgi?ico=" + ico.ToString();
                var wc = new WebClient();
                var xml = wc.DownloadString(url);
                var doc = new XmlDocument();
                doc.LoadXml(xml);
                var nm = new XmlNamespaceManager(doc.NameTable);
                nm.AddNamespace("are", "http://wwwinfo.mfcr.cz/ares/xml_doc/schemas/ares/ares_answer/v_1.0.1");
                var elem = doc.SelectSingleNode("//are:Obchodni_firma", nm);
                Console.WriteLine(elem.InnerText);
        }
}