Bonjour à tous, je cherche à créer une webpart sharepoint pour afficher un flux RSS

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using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.XPath;
 
namespace WebPartRSS.MyWebPartRSS
{
    [ToolboxItemAttribute(false)]
    public class MyWebPartRSS : WebPart
    {
 
        protected override void CreateChildControls()
        {
            string rssfeed = "http://feeds2.feedburner.com/dfblogs";
            DisplayRSS(rssfeed);
        }
 
        protected string DisplayRSS(string ListRssUrl)
        {
            try
            {
                string rss_text = "";
                string title = "";
                string link = "";
                string description = "";
 
                XPathDocument doc = new XPathDocument(ListRssUrl);
                XPathNavigator nav = doc.CreateNavigator();
                XPathNodeIterator items = nav.Select("//item");
 
                int items_to_show = 2;
                int count = 0;
                while (items.MoveNext() && count < items_to_show)
                {
                    XPathNavigator navCurrent = items.Current;
 
                    try
                    {
                        title = navCurrent.SelectSingleNode("title").InnerXml;
                        link = navCurrent.SelectSingleNode("link").InnerXml;
                        description = navCurrent.SelectSingleNode("description").InnerXml;
 
                    }
                    catch { }
 
                    CleanUp(ref title, ref description); // Calling a FeedClean Function
 
                    if (description != "")
                    {
                        description = "- " + description;
                        description += "...";
                    }
 
                    rss_text += "<a href='" + link + "' target='_blank'>" + title + "</a> " + description;
 
                    if (count < items_to_show - 1)
                        rss_text += "<br/><br/>";
 
                    rss_text += "</div>";
 
                    count++;
                }
                return rss_text;
            }
            catch
            { }
        }
 
 
        protected void CleanUp(ref string title, ref string description)
        {
            title = title.Replace("\n", " ");
            title = title.Replace("\r", " ");
 
            description = description.Replace("<", "<");
            description = description.Replace(">", ">");
 
            description = Regex.Replace("hover_description", @"<(.\n)*?>", string.Empty); // To Remove all the html tags from the RSS feed.
 
            title = title.Trim();
            description = description.Trim();
        }
    }
}
Seulement la méthode DisplayRSS me retourne l'erreur
Tous les chemins ne retournent pas nécessairement une valeur.
Avez vous une idée?

Merci d'avance