private void button1_Click(object sender, EventArgs e)
        {
            int i;

            rssReader.Load(feedURL);

            XmlNode firstNode = rssReader.DocumentElement.FirstChild;

            if (firstNode.HasChildNodes)
            {
                for (i = 0; i < firstNode.ChildNodes.Count; i++)
                {
                    feedTree.Nodes.Add(firstNode.ChildNodes.Item(i).LocalName);
                }
                
            }
        }