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FormView.OnModeChanging Method

Raises the ModeChanging event.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)
protected virtual void OnModeChanging(
	FormViewModeEventArgs e
)

Parameters

e
Type: System.Web.UI.WebControls.FormViewModeEventArgs

A FormViewModeEventArgs that contains the event data.

ExceptionCondition
HttpException

This method is called when the FormView control is not bound to a data source control, the mode change was not canceled, and an event handler is not registered for the event.

The OnModeChanging method is called by the FormView control to raise the ModeChanging event. It is generally used by control developers when extending the FormView class.

Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.

The OnModeChanging method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors

When overriding OnModeChanging in a derived class, be sure to call the base class's OnModeChanging method so that registered delegates receive the event.

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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