void videoForm_FormClosed(object sender, FormClosedEventArgs e)
{
if (videoForm != null)
{
videoForm.Dispose();
videoForm = null;
}
}
void showVideo(VideoEventArgs e)
{
if (videoForm == null)
{
videoForm = new VideoForm(airplay, e.SessionId);
videoForm.FormClosed += videoForm_FormClosed;
videoForm.Show();
}
videoForm.LoadVideo(e);
}