Add and Remove Action Handler Dynamically : Action Handler « GUI « VB.Net

1. VB.Net
2. GUI
3. Action Handler

Add and Remove Action Handler Dynamically

Imports System
Imports System.ComponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Configuration
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Text
Imports System.Globalization
Imports System.Text
Imports System.Collections

Public Class MainClass
    Shared Sub Main()
        Dim myform As Form = New Form1()
        Application.Run(myform)
    End Sub
End Class


Public Class Form1
    Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged
        If RadioButton1.Checked Then
            AddHandler Button1.Click, AddressOf ButtonHandler1
        Else
            RemoveHandler Button1.Click, AddressOf ButtonHandler1
        End If
    End Sub

    Private Sub RadioButton2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton2.CheckedChanged
        If RadioButton2.Checked Then
            AddHandler Button1.Click, AddressOf ButtonHandler2
        Else
            RemoveHandler Button1.Click, AddressOf ButtonHandler2
        End If
    End Sub

    Private Sub ButtonHandler1(ByVal sender As System.Object, ByVal e As System.EventArgs)
        MessageBox.Show("Button Handler1")
    End Sub
    Private Sub ButtonHandler2(ByVal sender As System.Object, ByVal e As System.EventArgs)
        MessageBox.Show("Button Handler2")
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        RadioButton1.Checked = True
    End Sub

End Class


<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        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.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.RadioButton1 = New System.Windows.Forms.RadioButton
        Me.RadioButton2 = New System.Windows.Forms.RadioButton
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'RadioButton1
        '
        Me.RadioButton1.AutoSize = True
        Me.RadioButton1.Location = New System.Drawing.Point(8, 8)
        Me.RadioButton1.Name = "RadioButton1"
        Me.RadioButton1.Size = New System.Drawing.Size(99, 17)
        Me.RadioButton1.TabIndex = 0
        Me.RadioButton1.Text = "ButtonHandler1"
        Me.RadioButton1.UseVisualStyleBackColor = True
        '
        'RadioButton2
        '
        Me.RadioButton2.AutoSize = True
        Me.RadioButton2.Location = New System.Drawing.Point(8, 40)
        Me.RadioButton2.Name = "RadioButton2"
        Me.RadioButton2.Size = New System.Drawing.Size(99, 17)
        Me.RadioButton2.TabIndex = 1
        Me.RadioButton2.Text = "ButtonHandler2"
        Me.RadioButton2.UseVisualStyleBackColor = True
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(152, 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(75, 23)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "Button1"
        Me.Button1.UseVisualStyleBackColor = True
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.RadioButton2)
        Me.Controls.Add(Me.RadioButton1)
        Me.Name = "Form1"
        Me.Text = "AddRemoveHandler"
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
    Friend WithEvents RadioButton1 As System.Windows.Forms.RadioButton
    Friend WithEvents RadioButton2 As System.Windows.Forms.RadioButton
    Friend WithEvents Button1 As System.Windows.Forms.Button

End Class

           
       

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