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Control.EnabledChanged Event

Occurs when the Enabled property value has changed.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public event EventHandler EnabledChanged
/** @event */
public void add_EnabledChanged (EventHandler value)

/** @event */
public void remove_EnabledChanged (EventHandler value)

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

This event is raised if the Enabled property is changed by either a programmatic modification or user interaction.

For more information about handling events, see Consuming Events.

The following code example uses two RadioButton controls to demonstrate the EnabledChanged event. Clicking one button changes the value of the Enabled property of the other button to false and displays a MessageBox.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form
    private RadioButton radioButton1;
    private RadioButton radioButton2;

    public Form1()
    static void Main()
        Application.Run(new Form1());

    private void InitializeComponent()
        this.radioButton1 = new System.Windows.Forms.RadioButton();
        this.radioButton2 = new System.Windows.Forms.RadioButton();
        // radioButton1
        this.radioButton1.AutoSize = true;
        this.radioButton1.Location = new System.Drawing.Point(0, 0);
        this.radioButton1.Name = "radioButton1";
        this.radioButton1.Size = new System.Drawing.Size(62, 17);
        this.radioButton1.TabIndex = 0;
        this.radioButton1.TabStop = true;
        this.radioButton1.Text = "Button1";
        this.radioButton1.UseVisualStyleBackColor = true;
        this.radioButton1.EnabledChanged += new System.EventHandler(this.radioButton1_EnabledChanged);
        // radioButton2
        this.radioButton2.AutoSize = true;
        this.radioButton2.Location = new System.Drawing.Point(0, 39);
        this.radioButton2.Name = "radioButton2";
        this.radioButton2.Size = new System.Drawing.Size(100, 17);
        this.radioButton2.TabIndex = 1;
        this.radioButton2.TabStop = true;
        this.radioButton2.Text = "Disable Button1";
        this.radioButton2.UseVisualStyleBackColor = true;
        this.radioButton2.CheckedChanged += new System.EventHandler(this.radioButton2_CheckedChanged);
        // Form1
        this.ClientSize = new System.Drawing.Size(292, 273);
        this.Name = "Form1";


    private void radioButton2_CheckedChanged(object sender, EventArgs e)
        radioButton1.Enabled = false;

    private void radioButton1_EnabledChanged(object sender, EventArgs e)
        MessageBox.Show("This button has been disabled.");

Windows 98, Windows Server 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 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, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0