This documentation is archived and is not being maintained.

ApplicationSettingsBase.SettingChanging Event

Occurs before the value of an application settings property is changed.

Namespace: System.Configuration
Assembly: System (in system.dll)

public event SettingChangingEventHandler SettingChanging
/** @event */
public void add_SettingChanging (SettingChangingEventHandler value)

/** @event */
public void remove_SettingChanging (SettingChangingEventHandler value)

In JScript, you can handle the events defined by a class, but you cannot define your own.
Not applicable.

The SettingChanging event occurs before an application setting value property is changed through the Item method. This event is not raised when the Reload or Reset methods are called. SettingChanging can be canceled through the SettingChangingEventArgs event data class.

You typically use the SettingChanging event to handle immediate validation of an individual settings property. For more information about validation, see How to: Validate Application Settings.

There is no corresponding SettingChanged event for this class; instead, see the PropertyChanged event.

The following code example shows the SettingChanging event handler for object of type FormSettings, which is a wrapper class derived from ApplicationSettingsBase. The handler displays the event information in a textbox named tbStatus. The full code example is listed in the ApplicationSettingsBase class overview.

void frmSettings1_SettingChanging(object sender, SettingChangingEventArgs e)
    tbStatus.Text = e.SettingName + ": " + e.NewValue;

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0