docs-desktop/dotnet-desktop-guide/framework/winforms/multiple-controls-bound-to-data-source-synchronized.md

title, ms.date, dev_langs, helpviewer_keywords, ms.assetid

title	ms.date	dev_langs	helpviewer_keywords	ms.assetid
How to: Ensure Multiple Controls Bound to the Same Data Source Remain Synchronized	03/30/2017	csharp vb	controls [Windows Forms], binding multiple controls [Windows Forms], synchronizing with data source	c2f0ecc6-11e6-4c2c-a1ca-0759630c451e

How to: Ensure Multiple Controls Bound to the Same Data Source Remain Synchronized

Oftentimes when working with data binding in Windows Forms, multiple controls are bound to the same data source. In some cases, it may be necessary to take extra steps to ensure that the bound properties of the controls remain synchronized with each other and the data source. These steps are necessary in two situations:

• If the data source does not implement xref:System.ComponentModel.IBindingList, and therefore generate xref:System.ComponentModel.IBindingList.ListChanged events of type xref:System.ComponentModel.ListChangedType.ItemChanged.

• If the data source implements xref:System.ComponentModel.IEditableObject.

In the former case, you can use a xref:System.Windows.Forms.BindingSource to bind the data source to the controls. In the latter case, you use a xref:System.Windows.Forms.BindingSource and handle the xref:System.Windows.Forms.BindingSource.BindingComplete event and call xref:System.Windows.Forms.BindingManagerBase.EndCurrentEdit%2A on the associated xref:System.Windows.Forms.BindingManagerBase.

Example

The following code example demonstrates how to bind three controls—two text-box controls and a xref:System.Windows.Forms.DataGridView control—to the same column in a xref:System.Data.DataSet using a xref:System.Windows.Forms.BindingSource component. This example demonstrates how to handle the xref:System.Windows.Forms.BindingSource.BindingComplete event and ensure that when the text value of one text box is changed, the additional text box and the xref:System.Windows.Forms.DataGridView control are updated with the correct value.

The example uses a xref:System.Windows.Forms.BindingSource to bind the data source and the controls. Alternatively, you can bind the controls directly to the data source and retrieve the xref:System.Windows.Forms.BindingManagerBase for the binding from the form's xref:System.Windows.Forms.Control.BindingContext%2A and then handle the xref:System.Windows.Forms.BindingManagerBase.BindingComplete event for the xref:System.Windows.Forms.BindingManagerBase. For an example of how to do this, see the Help page about the xref:System.Windows.Forms.BindingManagerBase.BindingComplete event of xref:System.Windows.Forms.BindingManagerBase.

[!code-csharpSystem.Windows.Forms.BindingSourceMultipleControls#1] [!code-vbSystem.Windows.Forms.BindingSourceMultipleControls#1]

Compiling the Code

• This code example requires

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

• A form with the xref:System.Windows.Forms.Form.Load event handled and a call to the InitializeControlsAndDataSource method in the example from the form's xref:System.Windows.Forms.Form.Load event handler.

See also

• How to: Share Bound Data Across Forms Using the BindingSource Component
• Change Notification in Windows Forms Data Binding
• Interfaces Related to Data Binding
• Windows Forms Data Binding