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

            rssReader.Load(feedURL);

            XmlNode firstNode = rssReader.DocumentElement.FirstChild;
            XmlNode currentNode;

            if (firstNode.HasChildNodes)
            {
                for (i = 0; i < firstNode.ChildNodes.Count; i++)
                {
                    currentNode = firstNode.ChildNodes.Item(i);

                    if (currentNode.LocalName.Equals("item"))
                    {
                        feedTree.Nodes.Add(currentNode.FirstChild.InnerText);
                    }
                    
                }
            }
        }