I can't control the video with the TrackBar1 scroller with vlc c#

Question

this code

I have tried axVLCPlugin21.input.time = trackBar1.Value; but to no avail

code

private void trackBar1_Scroll(object sender, EventArgs e)
        {
            axVLCPlugin21.input.time = trackBar1.Value;
           
        }

        private void axVLCPlugin21_MediaPlayerTimeChanged(object sender, AxAXVLC.DVLCEvents_MediaPlayerTimeChangedEvent e)
        {
            lb_START.Text = TimeFormat(e.time);
            trackBar1.Value = e.time;
        }

        private void axVLCPlugin21_MediaPlayerPlaying(object sender, EventArgs e)
        {
            lb_END.Text = TimeFormat((int)axVLCPlugin21.input.length);
            trackBar1.Maximum = (int)axVLCPlugin21.input.length;
        }