public partial class Form1 : Form
    {
        public class Test : System.ComponentModel.INotifyPropertyChanged
        {
            private int m_Count = 0;
            public int Count
            {
                get { return m_Count; }
                set
                {
                    m_Count = value;
                    NotifyPropertyChanged("Count");
                }
            }

            public void Begin()
            {
                Thread thread = new Thread(Counter);
                thread.Start();
            }

            private void Counter()
            {
                for (int i = 0; i < 1000; i++)
                {
                    Count = i;
                    System.Threading.Thread.Sleep(100);
                }
            }

            public void NotifyPropertyChanged(string info)
            {
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs(info));
                }
            }

            #region INotifyPropertyChanged 成员

            public event PropertyChangedEventHandler PropertyChanged;

            #endregion
        }

        public Form1()
        {
            InitializeComponent();
            Binding binding = new Binding("Text", t, "Count");
            label1.DataBindings.Add(binding);
        }

        Test t = new Test();

        private void button1_Click(object sender, EventArgs e)
        {
            t.Begin();
        }

    }