AsyncWorker - A Typesafe BackgroundWorker (and about Threading in General)

using System;
using System.Windows.Forms;

namespace AsyncWorkerCs {

   public partial class uclCountDown : UserControl {

      private CountDown _CountDown = new CountDown();

      public uclCountDown() {
         InitializeComponent();
         this.Disposed += (s, e) => _CountDown.Dispose();
         _CountDown.Tick += _CountDown_Tick;
         ckIsRunning.DataBindings.Add("Checked", _CountDown,
            "IsRunning", false, DataSourceUpdateMode.OnPropertyChanged);
      }

      void _CountDown_Tick(object sender, CountDown.TickEventargs e) {
         label1.Text = e.Counter.ToString();
         if(e.Counter == 0) MessageBox.Show("Go!");
      }

      private void ckIsRunning_CheckedChanged(object sender, EventArgs e) {
         if(ckIsRunning.Checked) _CountDown.Start((int)udInitValue.Value);
      }

   }
}