Countdown timer in c# windows application example

    publicpartial classForm1:Form

    {

        intseconds;

        publicForm1()

        {

            InitializeComponent();

        }

        privatevoidbtnStart_Click(objectsender,EventArgse)

        {

            seconds=Convert.ToInt32(txtSeconds.Text);

            txtSeconds.Enabled=false;

            timer1.Start();

        }

        privatevoidtimer1_Tick(objectsender,EventArgse)

        {

  &nbs