NativeWindow.DefWndProc Method

Invokes the default window procedure associated with this window.

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

Public Sub DefWndProc ( _
	ByRef m As Message _
Dim instance As NativeWindow
Dim m As Message

public void DefWndProc (
	/** @ref */ Message m
JScript does not support passing value-type arguments by reference.



The message that is currently being processed.

Typically, you only call the DefWndProc method when you are intercepting window messages and would like the default window procedure to handle the message. DefWndProc should not be called to send a window message to the window; call the Win32 SendMessage function instead.

It is an error to call DefWndProc when the Handle property is 0.

Notes to Inheritors Override this method in a derived class to implement generalized custom message handling for a specific native window or .NET Windows Forms Control. Custom processing can be performed before, after, or instead of a call to the base class implementation of this method, which performs standard message processing. In contrast, adding customized message handling for an application can be accomplished through the AddMessageFilter method of the Application class.

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0