Thread thread=new Thread(new ThreadStart(TestThread));
thread.Start();
private void TestThread()
{
       for (int i = 0; i < 11;i++ )
       {
            Thread.Sleep(2000);
            this.listBox1.Dispatcher.Invoke(new Action(() => { this.listBox1.Items.Add("this is a test!!!"); }));
        }
}
//csharp/6997