c# orderby wrong ordering

Question

foreach (var item in items.SearchQuery(textBox1.Text, 1))
      {
                Video video = new Video();
                video.Url = item.Url;
                list.Add(video);
                           using (var client = new WebClient())
                {
                    var html = client.DownloadString(video.Url);
                    // HtmlAgilityPack class
                    var htmlDoc = new HtmlAgilityPack.HtmlDocument();
                    htmlDoc.LoadHtml(html);
                    var htmlElement = htmlDoc.DocumentNode.Element("meta");
                    HtmlNode mdnode =
      htmlDoc.DocumentNode.SelectSingleNode("//meta[@name='keywords']");
                        var htmlAtribute = mdnode.Attributes["content"];
                        string fulldescription = htmlAtribute.Value;
                        byte[] bytes = Encoding.Default.GetBytes(fulldescription);
                        fulldescription = Encoding.UTF8.GetString(bytes);
                        string text = fulldescription;
                    Collection<string> collection = new Collection<string>();
                    string[] bits = text.Split(',');
                    foreach (string rr in bits)
                    {
                        collection.Add(rr);
                    }
                        var sortedElements = from rr in collection
                                             orderby rr.Length descending
                                             select rr;
                    foreach (string c in sortedElements)
                    {
                        listbox1.Items.Add(c);
                    }
                }
            }
}

The Output :( As you can see , it is ordering part by part, but i want full order which should includes all items in the listbox