private void tsbAdd_Click(object sender, EventArgs e)
        {
            frmSubscribeConfigDialog frm = new frmSubscribeConfigDialog();

            if (frm.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                ListViewItem item = new ListViewItem();
                item.Tag = new ServerGroup()
                {
                    Name = frm.GroupName,
                    URL  = frm.GrouURL
                };
                item.Text = frm.GroupName;
                item.SubItems.Add(frm.GrouURL);

                lstData.Items.Add(item);
            }
        }
        private void tsbModify_Click(object sender, EventArgs e)
        {
            if (lstData.SelectedItems.Count != 1)
            {
                return;
            }

            ListViewItem item  = lstData.SelectedItems[0];
            ServerGroup  group = item.Tag as ServerGroup;

            frmSubscribeConfigDialog frm = new frmSubscribeConfigDialog();

            frm.GroupName = group.Name;
            frm.GrouURL   = group.URL;

            if (frm.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                group.Name = frm.GroupName;
                group.URL  = frm.GrouURL;

                item.Text             = group.Name;
                item.SubItems[1].Text = group.URL;
            }
        }