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public partial class Form1 : Form, INotifyPropertyChanged
{
  private string tb1Text = null;
  public string Tb1Text 
  {
    get { return tb1Text; }
    set 
    {
      if (tb1Text != value)
      {
        tb1Text = value;
        NotifyPropertyChanged("Tb1Text");
      }
    }
  }

  public Form1()
  {
    InitializeComponent();
    InitializeTextBoxes();
  }

  private void InitializeTextBoxes()
  {
    TextBox tb = new TextBox();
    tb.DataBindings.Add("Text", this, "Tb1Text", false, DataSourceUpdateMode.OnPropertyChanged);
    this.Controls.Add(tb);
  }

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

  #region INotifyPropertyChanged Member
  public event PropertyChangedEventHandler PropertyChanged;
  #endregion
}