public void UnRegisterListener(INoKeyboardInStockListener existingListner)
{
noKeyboardInStockListeners.Remove(existingListner);
}
/// <summary>
/// Register Listers who are interested to listen when keybaord will be empty in stock.
/// </summary>
/// <param name="newListner"></param>
public void RegisterListener(INoKeyboardInStockListener newListner)
{
noKeyboardInStockListeners.Add(newListner);
}
