docs-desktop/dotnet-desktop-guide/framework/winforms/controls/raise-change-notifications--bindingsource.md

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title	ms.date	dev_langs	helpviewer_keywords	ms.assetid
How to: Raise Change Notifications Using a BindingSource and the INotifyPropertyChanged Interface	03/30/2017	csharp vb	change notifications [Windows Forms], raising BindingSource component [Windows Forms], and IPropertyChange data sources [Windows Forms], detecting changes examples [Windows Forms], BindingSource component change notifications INotifyPropertyChanged interface [Windows Forms], using with BindingSource BindingSource component [Windows Forms], examples	7fa2cf51-c09f-4375-adf0-e36c5617f099

How to: Raise Change Notifications Using a BindingSource and the INotifyPropertyChanged Interface

The xref:System.Windows.Forms.BindingSource component automatically detects changes in a data source when the type contained in the data source implements xref:System.ComponentModel.INotifyPropertyChanged and raises xref:System.ComponentModel.INotifyPropertyChanged.PropertyChanged events when a property value is changed. This change detection is useful because controls bound to the xref:System.Windows.Forms.BindingSource automatically update as the data source values change.

Note

If your data source implements xref:System.ComponentModel.INotifyPropertyChanged and you are performing asynchronous operations, you should not make changes to the data source on a background thread. Instead, you should read the data on a background thread and merge the data into a list on the UI thread.

Example

The following code example demonstrates a simple implementation of the xref:System.ComponentModel.INotifyPropertyChanged interface. It also shows how the xref:System.Windows.Forms.BindingSource automatically passes a data source change to a bound control when the xref:System.Windows.Forms.BindingSource is bound to a list of the xref:System.ComponentModel.INotifyPropertyChanged type.

If you use the CallerMemberName attribute, calls to the NotifyPropertyChanged method don't have to specify the property name as a string argument. For more information, see Caller Information (C#) or Caller Information (Visual Basic).

[!code-csharpSystem.ComponentModel.IPropertyChangeExample#1] [!code-vbSystem.ComponentModel.IPropertyChangeExample#1]

Compiling the Code

This example requires:

• References to the System, System.Data, System.Drawing, and System.Windows.Forms assemblies.

See also

• xref:System.ComponentModel.INotifyPropertyChanged
• BindingSource Component
• How to: Raise Change Notifications Using the BindingSource ResetItem Method