Unsubscriber

public void UnSubUsers()
      {
            string feedUrl = "http://gdata.youtube.com/feeds/api/users/" + username.Text + "/subscriptions";
            YouTubeQuery query = new YouTubeQuery(feedUrl);
            subFeed = service.GetSubscriptions(query);
            YouTubeRequestSettings yts = new YouTubeRequestSettings("Unsubscriber", DEVKEY, username.Text, password.Text);
            YouTubeRequest request = new YouTubeRequest(yts);
            int i = 0;
            int x = 0;
            x = (listBox1.Items.Count);
            for (i=0;i<x ;i++ )
            {
                string uname = listBox1.Items[i].ToString();
                uname=uname.Substring(42);
                uname = uname.Remove(uname.LastIndexOf("/"));
                Subscription s = new Subscription();
                s.Type = SubscriptionEntry.SubscriptionType.channel;
                s.UserName = uname;
                //MessageBox.Show(uname); //Displays the username so that we know if it is correct
                try
                {
                    s.AtomEntry.EditUri = "http://gdata.youtube.com/feeds/api/users/" + username.Text + "/subscriptions";
                    s.SubscriptionEntry.EditUri = "http://gdata.youtube.com/feeds/api/users/" + username.Text + "/subscriptions";
                    request.Delete(s);
                }
                catch (ArgumentNullException e)
                {
                    MessageBox.Show(e.ToString(), "Error");
                }
                catch (GDataRequestException e)
                {
                    MessageBox.Show(e.ToString(), "Error");
                }
            }
        }