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IButtonControl.NotifyDefault Method

Notifies a control that it is the default button so that its appearance and behavior is adjusted accordingly.

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

void NotifyDefault(
	bool value


Type: System.Boolean
true if the control should behave as a default button; otherwise false.

This method is called by a parent form to make a control the default button. Default buttons are set to have an extra thick border.

The following example inherits from the ButtonBase class and implements the IButtonControl interface. Implementation is added to the DialogResult property and the NotifyDefault and PerformClick methods.

using System;
using System.Windows.Forms;
using System.Drawing;

public class MyButton : ButtonBase, IButtonControl
	private DialogResult myDialogResult;

	public MyButton()
		// Make the button White and a Popup style
		// so it can be distinguished on the form.
		this.FlatStyle = FlatStyle.Popup;
		this.BackColor = Color.White;
	// Add implementation to the IButtonControl.DialogResult property.
	public DialogResult DialogResult
			return this.myDialogResult;

			if(Enum.IsDefined(typeof(DialogResult), value))				
				this.myDialogResult = value;

	// Add implementation to the IButtonControl.NotifyDefault method.
	public void NotifyDefault(bool value)
		if(this.IsDefault != value)
			this.IsDefault = value;

	// Add implementation to the IButtonControl.PerformClick method.
	public void PerformClick()

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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