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DataSourceUpdateMode Enumeration

Updated: October 2008

Specifies when a data source is updated when changes occur in the bound control.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public enum DataSourceUpdateMode

Member nameDescription
Supported by the .NET Compact FrameworkOnValidationData source is updated when the control property is validated,

After validation, the value in the control property will also be re-formatted.

Supported by the .NET Compact FrameworkOnPropertyChangedData source is updated whenever the value of the control property changes.
Supported by the .NET Compact FrameworkNeverData source is never updated and values entered into the control are not parsed, validated or re-formatted.

When a control is bound to a data source using a Binding object, you can specify when an update to the data source will occur using the DataSourceUpdateMode enumeration.

When the update mode is Never, you can force the data source to be updated by using the WriteValue method.


Even when the update mode is set to Never, the data source will be updated when the binding is first created, so that at least one update will always occur.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5, 2.0




October 2008

Added note in Remarks section.

Customer feedback.