CODE:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Xml;
using System.ServiceModel.Syndication;

namespace RssReader
{
    class Program
    {
        static void Main(string[] args)
        {
            string url = "http://www3.nhk.or.jp/rss/news/cat0.xml";

            using (XmlReader rdr = XmlReader.Create(url))
            {
                SyndicationFeed feed = SyndicationFeed.Load(rdr);

                Console.WriteLine("title:" + feed.Title.Text);
                Console.WriteLine("description:" + feed.Description.Text);
                Console.WriteLine("--- items ---");

                foreach (SyndicationItem item in feed.Items)
                {
                    Console.WriteLine("item Title:" + item.Title.Text);
                    Console.WriteLine("詳細:" + item.Summary.Text);
                    Console.WriteLine("Data:" + item.PublishDate.ToString());
                    Console.WriteLine("");
                }
            }
        }
    }
}