M'he animat i he posat RSS al blog, ja que també m'ho han demanat. Doncs dit i fet. El cas és que tampoc és gaire difícil fer-ho. Hi ha unes classes de .NET SyndicationFeed, que ho fan fàcil. Cal fer un ASHX i posar el "using System.ServiceModel.Syndication;", després un parell de bucles, es recupera de la BBDD amb la clsDades els posts i voilà. Com sempre el codi.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ServiceModel.Syndication;
using System.IO;
using System.Xml;
using System.Data;
using Blog.data;

namespace Blog
{
    /// <summary>
    /// Summary description for RSS
    /// </summary>
    public class RSS : IHttpHandler
    {
        private clsConfig Conf = new clsConfig();
        private string ConnStr = "";

        //Cal posar al Blog.aspx:
        //<link rel="alternate" type="application/rss+xml" href="RSS.ashx" title="Blog Feed"/>

        public void ProcessRequest(HttpContext context)
        {
            Conf.Initialize();
            ConnStr = Conf.GetVal("CadConn");

            SyndicationFeed feed = CreateRecentPostsFeed();


            var output = new StringWriter();
            var writer = new XmlTextWriter(output);

            new Rss20FeedFormatter(feed).WriteTo(writer);

            context.Response.ContentType = "application/rss+xml";
            context.Response.Write(output.ToString());
        }

        private SyndicationFeed CreateRecentPostsFeed()
        {
            List<SyndicationItem> syndicationItems = GetPostsRecents();

            return new SyndicationFeed(syndicationItems)
            {
                Title = new TextSyndicationContent("Blog"),
                Description = new TextSyndicationContent("Una mica de tot i a vegades més"),
                ImageUrl = new Uri("http://blog.canalda.net/Img/laughing_man_p.jpg")
            };
        }

        private List<SyndicationItem> GetPostsRecents()
        {
            List<SyndicationItem> Posts = new List<SyndicationItem>();
            clsPosts PostsTA = new clsPosts(ConnStr);
            Dictionary<string, string> Params = new Dictionary<string, string>();
            DateTime FPubs = DateTime.Now;
            DataTable PostsTBL;
            FPubs = FPubs.Subtract(TimeSpan.FromDays(7));
            Params.Add("DataPubMesGran", PostsTA.DateTimeToSQL(FPubs, "0"));
            Params.Add("Actiu", "true");

            PostsTBL = PostsTA.GET(Params);

            foreach (DataRow Post in PostsTBL.Rows)
            {
                Posts.Add(GeneraSyndicacioPost(Post));
            }

            return Posts;
        }

        private SyndicationItem GeneraSyndicacioPost(DataRow DR)
        {
            string id = DR["IdPost"].ToString();
            string title = String.Format("Post: {1}", id, DR["Titol"]);
            string content = DR["PostText"].ToString();
            DateTimeOffset DataPub = new DateTimeOffset((DateTime) DR["DataPub"]);
            Uri url = new Uri(String.Format("http://blog.canalda.net/Post.aspx?IdPost={0}", id));

            return new SyndicationItem(title, content, url, id, DataPub); 
            // { Summary = new TextSyndicationContent(content) };
        }


        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}