/// <summary>
        /// Add all videos to <see cref="VideosListView"/> from <see cref="Channels.GetAllVideos(string)"/>.
        /// Clears all existing videos already in the listview (if any).
        /// </summary>
        /// <param name="channelID">Channel ID to add the videos from.</param>
        public void AddChannelVideos(string channelID)
        {
            VideosListView.BeginUpdate();
            VideosListView.Items.Clear();

            IEnumerable <Database.Types.Video> videos = Database.Channels.GetAllVideos(channelID).OrderByDescending(v => v.Posted);

            foreach (Database.Types.Video video in videos)
            {
                AddVideoToListView(video);
            }

            VideosListView.Columns[PostedColumn.Index].TextAlign = HorizontalAlignment.Right;
            VideosListView.EndUpdate();
        }
        /// <summary>
        /// Add all channels to <see cref="ChannelsListView"/> from <see cref="Channels.GetAll()"/>.
        /// Clears all existing channels already in the listview (if any).
        /// </summary>
        public void AddAllChannels()
        {
            ChannelsListView.BeginUpdate();
            VideosListView.BeginUpdate();

            ChannelsListView.Items.Clear();
            VideosListView.Items.Clear();

            ChannelsListViewChanged();
            foreach (Database.Types.Channel channel in Database.Channels.GetAll())
            {
                AddChannelToListView(channel);
            }

            ChannelsListView.EndUpdate();
            VideosListView.EndUpdate();
        }