private void BtnCheck_Click(object sender, RoutedEventArgs e)
        {
            if (lvBookmakes.SelectedItem == null)
            {
                return;
            }
            var sl = lvBookmakes.SelectedItem as Bookmaker;

            try
            {
                client.AddSiteData(sl.BkType, txtUrl.Text);
                client.SendSiteData(sl.BkType);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Не удалось добавить зеркало" + ex.Message);
            }
        }