RadioDld.Main.ButtonSubscribe_Click C# (CSharp) Method

        private void ButtonSubscribe_Click()
        {
            int progid;

            switch (this.view.CurrentView)
            {
                case ViewState.View.ProgEpisodes:
                    progid = (int)this.view.CurrentViewData;
                    break;
                case ViewState.View.Favourites:
                    progid = Convert.ToInt32(this.ListFavourites.SelectedItems[0].Name, CultureInfo.InvariantCulture);
                    break;
                default:
                    throw new InvalidOperationException("Subscribe not valid in " + this.view.CurrentView.ToString() + " view");
            }

            if (Model.Subscription.Add(progid))
            {
                this.view.SetView(ViewState.MainTab.Subscriptions, ViewState.View.Subscriptions, null);
            }
            else
            {
                MessageBox.Show("This programme only has one episode, which is already in the download list.", Application.ProductName, MessageBoxButtons.OK);
            }
        }