private void Play_btn_Click(object sender, EventArgs e)
{
if (PlayOrder.Count == 0)
{
this.Play_btn.Text = "Play";
return;
}
if (currentPlayableEntity != null)
{
currentPlayableEntity.Stop();
}
this.Play_btn.Text = "Next";
currentPlayableEntity = PlayOrder.Dequeue();
currentPlayableEntity.Play();
}