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Page.OnPreInit Method

Raises the PreInit event at the beginning of page initialization.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)
protected virtual void OnPreInit(
	EventArgs e
)

Parameters

e
Type: System.EventArgs

An EventArgs that contains the event data.

The OnPreInit method is called at the beginning of the page initialization stage.

After the OnPreInit method is called, personalization information is loaded and the page theme, if any, is initialized. This is also the preferred stage to dynamically define a PageTheme or MasterPage for the Page.

Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

The OnPreInit 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 OnPreInit in a derived class, be sure to call the base class's OnPreInit 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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