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public class BusinessObject :INotifyPropertyChanged 
{      
    public event PropertyChangedEventHandler PropertyChanged;           

    private string _Name = "";
    public string Name
    {
        get { return _Name; }
        set { _Name = value;
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs("Name"));
        }
    }       
}					

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textBox1.DataBindings.Add(new Binding("Text", business, "Name"));//business=Instanz von BusinessObject					

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public void RaisePropertyChanged(string PropertyName) {
  var tmp = PropertyChanged;
  if (tmp != null)
    tmp(this,  new PropertyChangedEventArgs(PropertyName));
}					

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textBox1.DataBindings.Add(new Binding("Text", business, "Name"))					

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textBox1.DataBindings.Add(new Binding("Text", business, "Name",false ,DataSourceUpdateMode.OnPropertyChanged ))