Add, remove event handler to/from ToggleButton : Event « Event « VB.Net Tutorial

1. VB.Net Tutorial
2. Event
3. Event

Imports System.Windows.Forms

public class AddHandlerAndRemoveHandlerForToggleButton
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents CheckBox1 As System.Windows.Forms.CheckBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.CheckBox1 = New System.Windows.Forms.CheckBox
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(40, 32)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Click Me!"
        '
        'CheckBox1
        '
        Me.CheckBox1.Appearance = System.Windows.Forms.Appearance.Button
        Me.CheckBox1.Checked = True
        Me.CheckBox1.CheckState = System.Windows.Forms.CheckState.Checked
        Me.CheckBox1.Location = New System.Drawing.Point(136, 31)
        Me.CheckBox1.Name = "CheckBox1"
        Me.CheckBox1.Size = New System.Drawing.Size(128, 24)
        Me.CheckBox1.TabIndex = 1
        Me.CheckBox1.Text = "Toggle Event Handling"
        Me.CheckBox1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.CheckBox1)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub CheckBox1_CheckedChanged( _
            ByVal sender As System.Object, _
            ByVal e As System.EventArgs) _
            Handles CheckBox1.CheckedChanged
        If CheckBox1.Checked Then
            AddHandler Button1.Click, _
                AddressOf myClickHandler
        Else
            RemoveHandler Button1.Click, _
                AddressOf myClickHandler
        End If
    End Sub

    Private Sub myClickHandler( _
            ByVal sender As System.Object, _
            ByVal e As System.EventArgs)
        MsgBox("Event Handled!")
    End Sub
End Class

11.1.Event
	11.1.1.	Raise Events
	11.1.2.	Multiple Event Handler
	11.1.3.	Event handler
	11.1.4.	Subclass EventArgs to create your own event arguments
	11.1.5.	Inherit Event
	11.1.6.	Custom event handler
	11.1.7.	WithEvents and Event method
	11.1.8.	Add and remove event handler
	11.1.9.	Handle events from more than one components
	11.1.10.	Add, remove event handler to/from ToggleButton
	11.1.11.	Use one method to handle more than one RadioButton click event
	11.1.12.	Get event sender type
	11.1.13.	Instantiating the Action<(Of <(T>)>) delegate rather than explicitly defining a new delegate and assigning a named method