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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)

'Declaration
Public Event EnabledChanged As EventHandler

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 Handling and Raising 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.

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms



Public Class Form1
   Inherits Form
   Private WithEvents radioButton1 As RadioButton
   Private WithEvents radioButton2 As RadioButton


   Public Sub New()
      InitializeComponent()
   End Sub

   <STAThread()>  _
   Shared Sub Main()
      Application.EnableVisualStyles()
      Application.SetCompatibleTextRenderingDefault(False)
      Application.Run(New Form1())
   End Sub 


   Private Sub InitializeComponent()
      Me.radioButton1 = New System.Windows.Forms.RadioButton()
      Me.radioButton2 = New System.Windows.Forms.RadioButton()
      Me.SuspendLayout()
      '  
      ' radioButton1 
      '  
      Me.radioButton1.AutoSize = True 
      Me.radioButton1.Location = New System.Drawing.Point(0, 0)
      Me.radioButton1.Name = "radioButton1" 
      Me.radioButton1.Size = New System.Drawing.Size(62, 17)
      Me.radioButton1.TabIndex = 0
      Me.radioButton1.TabStop = True 
      Me.radioButton1.Text = "Button1" 
      Me.radioButton1.UseVisualStyleBackColor = True 
      '  
      ' radioButton2 
      '  
      Me.radioButton2.AutoSize = True 
      Me.radioButton2.Location = New System.Drawing.Point(0, 39)
      Me.radioButton2.Name = "radioButton2" 
      Me.radioButton2.Size = New System.Drawing.Size(100, 17)
      Me.radioButton2.TabIndex = 1
      Me.radioButton2.TabStop = True 
      Me.radioButton2.Text = "Disable Button1" 
      Me.radioButton2.UseVisualStyleBackColor = True 
      '  
      ' Form1 
      '  
      Me.ClientSize = New System.Drawing.Size(292, 273)
      Me.Controls.Add(radioButton2)
      Me.Controls.Add(radioButton1)
      Me.Name = "Form1" 
      Me.ResumeLayout(False)
      Me.PerformLayout()
   End Sub 


   Private Sub radioButton2_CheckedChanged(sender As Object, e As EventArgs) Handles radioButton2.CheckedChanged
      radioButton1.Enabled = False 
   End Sub 


   Private Sub radioButton1_EnabledChanged(sender As Object, e As EventArgs) Handles radioButton1.EnabledChanged
      MessageBox.Show("This button has been disabled.")
   End Sub 
End Class

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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