MW3 Media Player [Simple]

private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                listBox1.Items.Clear();
                OpenFileDialog a = new OpenFileDialog();
                a.Multiselect = true;
                a.ShowDialog(this);
                foreach (string b in a.FileNames)
                {
                     listBox1.Items.Add(b);
                }
                listBox1.SelectedIndex = 0;
                Play();
            }
            catch { }
        }


        void Play()
        {
            axWindowsMediaPlayer1.URL = listBox1.SelectedItem.ToString();
            axWindowsMediaPlayer1.Ctlcontrols.play();
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            Play();
        }


        bool visu = true;
        [DllImport("user32.dll")]
        public static extern Int16 GetAsyncKeyState(Keys vKey);
        private void timer1_Tick(object sender, EventArgs e)
        {
            try
            {
                if (Convert.ToBoolean(GetAsyncKeyState(Keys.F1))) { Play(); }
                if (Convert.ToBoolean(GetAsyncKeyState(Keys.F2))) {  axWindowsMediaPlayer1.Ctlcontrols.stop(); }
                if (Convert.ToBoolean(GetAsyncKeyState(Keys.F3))) { listBox1.SelectedIndex++; Play(); }
                if (Convert.ToBoolean(GetAsyncKeyState(Keys.F4))) { listBox1.SelectedIndex--; Play(); }
                if (Convert.ToBoolean(GetAsyncKeyState(Keys.Insert))){if (visu) { visu = false; this.Hide(); } else { visu = true; this.Show(); }}
                if (Convert.ToBoolean(GetAsyncKeyState(Keys.End))) { Application.Exit(); }
            }
            catch { }
        }

        private void timer2_Tick(object sender, EventArgs e)
        {
            if (axWindowsMediaPlayer1.playState == WMPPlayState.wmppsStopped) { listBox1.SelectedIndex++; Play(); }
        }