VB.Net by API/System.Windows.Forms/CheckedListBox

CheckedListBox.BeginUpdate()

  
Imports System.Windows.Forms
Module Module1
    Sub Main()
        Application.Run(New Form1)
    End Sub
End Module
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.ruponentModel.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 CheckedListBox1 As System.Windows.Forms.CheckedListBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckedListBox1 = New System.Windows.Forms.CheckedListBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        "
        "CheckedListBox1
        "
        Me.CheckedListBox1.Location = New System.Drawing.Point(24, 32)
        Me.CheckedListBox1.Name = "CheckedListBox1"
        Me.CheckedListBox1.Size = New System.Drawing.Size(360, 64)
        Me.CheckedListBox1.TabIndex = 0
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(152, 120)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Show Choice"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(416, 165)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.CheckedListBox1})
        Me.Name = "Form1"
        Me.Text = "CheckListBoxDemo"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Public List() As String = {"A","B","C","D"}
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        CheckedListBox1.BeginUpdate()
        CheckedListBox1.DataSource = List
        CheckedListBox1.EndUpdate()
    End Sub

    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        If (CheckedListBox1.SelectedItem <> "") Then
            Dim Entry As Object
            For Each Entry In CheckedListBox1.CheckedItems
                MessageBox.Show(Entry.ToString())
            Next
        Else
            MessageBox.Show("You must select an item")
        End If
    End Sub
End Class

CheckedListBox.CheckedIndices

  
Imports System.Windows.Forms
public class CheckedListBoxAddItemGetSelected
   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.ruponentModel.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 btnAddItems As System.Windows.Forms.Button
    Friend WithEvents clb1 As System.Windows.Forms.CheckedListBox
    Friend WithEvents btnGetCheckedIndices As System.Windows.Forms.Button
    Friend WithEvents btnGetCheckedItems As System.Windows.Forms.Button
    Friend WithEvents ColorDialog1 As System.Windows.Forms.ColorDialog
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.btnAddItems = New System.Windows.Forms.Button()
        Me.clb1 = New System.Windows.Forms.CheckedListBox()
        Me.btnGetCheckedItems = New System.Windows.Forms.Button()
        Me.btnGetCheckedIndices = New System.Windows.Forms.Button()
        Me.ColorDialog1 = New System.Windows.Forms.ColorDialog()
        Me.SuspendLayout()
        "
        "btnAddItems
        "
        Me.btnAddItems.BackColor = System.Drawing.SystemColors.ControlLight
        Me.btnAddItems.Location = New System.Drawing.Point(176, 8)
        Me.btnAddItems.Name = "btnAddItems"
        Me.btnAddItems.Size = New System.Drawing.Size(104, 24)
        Me.btnAddItems.TabIndex = 3
        Me.btnAddItems.Text = "Add Items"
        "
        "clb1
        "
        Me.clb1.Location = New System.Drawing.Point(16, 8)
        Me.clb1.Name = "clb1"
        Me.clb1.Size = New System.Drawing.Size(144, 79)
        Me.clb1.TabIndex = 4
        "
        "btnGetCheckedItems
        "
        Me.btnGetCheckedItems.BackColor = System.Drawing.SystemColors.ControlLight
        Me.btnGetCheckedItems.Location = New System.Drawing.Point(176, 40)
        Me.btnGetCheckedItems.Name = "btnGetCheckedItems"
        Me.btnGetCheckedItems.Size = New System.Drawing.Size(104, 24)
        Me.btnGetCheckedItems.TabIndex = 5
        Me.btnGetCheckedItems.Text = "Checked by Item"
        "
        "btnGetCheckedIndices
        "
        Me.btnGetCheckedIndices.BackColor = System.Drawing.SystemColors.ControlLight
        Me.btnGetCheckedIndices.Location = New System.Drawing.Point(176, 72)
        Me.btnGetCheckedIndices.Name = "btnGetCheckedIndices"
        Me.btnGetCheckedIndices.Size = New System.Drawing.Size(104, 24)
        Me.btnGetCheckedIndices.TabIndex = 6
        Me.btnGetCheckedIndices.Text = "Checked by Index"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(296, 277)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.btnGetCheckedIndices, Me.btnGetCheckedItems, Me.clb1, Me.btnAddItems})
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub btnAddItems_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddItems.Click
        clb1.Items.Add("A", True)
        clb1.Items.Add("B", True)
        clb1.Items.Add("C", True)
        clb1.Items.Add("D", False)
    End Sub
    Private Sub btnGetCheckedItems_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetCheckedItems.Click
        Dim o As Object
        For Each o In clb1.CheckedItems
            Console.WriteLine(o.ToString)
        Next o
        
    End Sub
    Private Sub btnGetCheckedIndices_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetCheckedIndices.Click
        Dim o As Object
        For Each o In clb1.CheckedIndices
            Console.WriteLine(o)
        Next o
    End Sub
End Class

CheckedListBox.CheckedItemCollection

  
Imports System
Imports System.Data
Imports System.Windows.Forms
Imports System.Drawing
Public Class MainClass
    
    Shared Sub Main()
        Dim form1 As Form = New Form1
        Application.Run(form1)
    End Sub
End Class

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles MyBase.Load
        clbStudents.Items.Add(New Student("A", "A"), True)
        clbStudents.Items.Add(New Student("B", "B"), False)
        clbStudents.Items.Add(New Student("C", "C"), _
            CheckState.Indeterminate)
    End Sub
    Private Sub btnListSelections_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnListSelections.Click
        Dim checked_items As CheckedListBox.CheckedItemCollection = clbStudents.CheckedItems
        Dim txt As String = "     Selected Students:" & vbCrLf
        For Each item As Object In checked_items
            txt &= item.ToString & vbCrLf
        Next item
        MessageBox.Show(txt)
    End Sub
End Class
Public Class Student
    Public FirstName As String
    Public LastName As String
    Public Sub New(ByVal first_name As String, ByVal last_name As String)
        FirstName = first_name
        LastName = last_name
    End Sub
    Public Overrides Function ToString() As String
        Return FirstName & " " & LastName
    End Function
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads 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.ruponentModel.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.clbStudents = New System.Windows.Forms.CheckedListBox
        Me.btnListSelections = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "clbStudents
        "
        Me.clbStudents.FormattingEnabled = True
        Me.clbStudents.Location = New System.Drawing.Point(8, 8)
        Me.clbStudents.Name = "clbStudents"
        Me.clbStudents.Size = New System.Drawing.Size(160, 123)
        Me.clbStudents.TabIndex = 0
        "
        "btnListSelections
        "
        Me.btnListSelections.Location = New System.Drawing.Point(8, 152)
        Me.btnListSelections.Name = "btnListSelections"
        Me.btnListSelections.Size = New System.Drawing.Size(160, 23)
        Me.btnListSelections.TabIndex = 1
        Me.btnListSelections.Text = "List Selections"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(180, 187)
        Me.Controls.Add(Me.btnListSelections)
        Me.Controls.Add(Me.clbStudents)
        Me.Name = "Form1"
        Me.Text = "UseCheckedListBox"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents clbStudents As System.Windows.Forms.CheckedListBox
    Friend WithEvents btnListSelections As System.Windows.Forms.Button
End Class

CheckedListBox.CheckedItems

  
Imports System
Imports System.Data
Imports System.Windows.Forms
Imports System.Drawing
Public Class MainClass
    
    Shared Sub Main()
        Dim form1 As Form = New Form1
        Application.Run(form1)
    End Sub
End Class

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles MyBase.Load
        clbStudents.Items.Add(New Student("A", "A"), True)
        clbStudents.Items.Add(New Student("B", "B"), False)
        clbStudents.Items.Add(New Student("C", "C"), _
            CheckState.Indeterminate)
    End Sub
    Private Sub btnListSelections_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnListSelections.Click
        Dim checked_items As CheckedListBox.CheckedItemCollection = clbStudents.CheckedItems
        Dim txt As String = "     Selected Students:" & vbCrLf
        For Each item As Object In checked_items
            txt &= item.ToString & vbCrLf
        Next item
        MessageBox.Show(txt)
    End Sub
End Class
Public Class Student
    Public FirstName As String
    Public LastName As String
    Public Sub New(ByVal first_name As String, ByVal last_name As String)
        FirstName = first_name
        LastName = last_name
    End Sub
    Public Overrides Function ToString() As String
        Return FirstName & " " & LastName
    End Function
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads 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.ruponentModel.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.clbStudents = New System.Windows.Forms.CheckedListBox
        Me.btnListSelections = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "clbStudents
        "
        Me.clbStudents.FormattingEnabled = True
        Me.clbStudents.Location = New System.Drawing.Point(8, 8)
        Me.clbStudents.Name = "clbStudents"
        Me.clbStudents.Size = New System.Drawing.Size(160, 123)
        Me.clbStudents.TabIndex = 0
        "
        "btnListSelections
        "
        Me.btnListSelections.Location = New System.Drawing.Point(8, 152)
        Me.btnListSelections.Name = "btnListSelections"
        Me.btnListSelections.Size = New System.Drawing.Size(160, 23)
        Me.btnListSelections.TabIndex = 1
        Me.btnListSelections.Text = "List Selections"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(180, 187)
        Me.Controls.Add(Me.btnListSelections)
        Me.Controls.Add(Me.clbStudents)
        Me.Name = "Form1"
        Me.Text = "UseCheckedListBox"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents clbStudents As System.Windows.Forms.CheckedListBox
    Friend WithEvents btnListSelections As System.Windows.Forms.Button
End Class

CheckedListBox.CheckedListBox

  
Imports System.Windows.Forms

public class CheckedListBoxAddObjects
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Private Sub Form1_Load(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles MyBase.Load
     
        Me.clbEmployees = New System.Windows.Forms.CheckedListBox
        Me.btnListSelections = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "clbEmployees
        "
        Me.clbEmployees.FormattingEnabled = True
        Me.clbEmployees.Location = New System.Drawing.Point(8, 8)
        Me.clbEmployees.Name = "clbEmployees"
        Me.clbEmployees.Size = New System.Drawing.Size(160, 123)
        Me.clbEmployees.TabIndex = 0
        "
        "btnListSelections
        "
        Me.btnListSelections.Location = New System.Drawing.Point(8, 152)
        Me.btnListSelections.Name = "btnListSelections"
        Me.btnListSelections.Size = New System.Drawing.Size(160, 23)
        Me.btnListSelections.TabIndex = 1
        Me.btnListSelections.Text = "List Selections"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(180, 187)
        Me.Controls.Add(Me.btnListSelections)
        Me.Controls.Add(Me.clbEmployees)
        Me.Name = "Form1"
        Me.Text = "UseCheckedListBox"
        Me.ResumeLayout(False)
     
        clbEmployees.Items.Add(New Employee("A", "A"), True)
        clbEmployees.Items.Add(New Employee("B", "B"), False)
        clbEmployees.Items.Add(New Employee("C", "C"), CheckState.Indeterminate)
    End Sub
    Private Sub btnListSelections_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnListSelections.Click
        Dim checked_items As CheckedListBox.CheckedItemCollection = clbEmployees.CheckedItems
        Console.WriteLine("Selected Employees:")
        For Each item As Object In checked_items
            Console.WriteLine(item.ToString)
        Next item
    End Sub
    Friend WithEvents clbEmployees As System.Windows.Forms.CheckedListBox
    Friend WithEvents btnListSelections As System.Windows.Forms.Button
End Class
Public Class Employee
    Public FirstName As String
    Public LastName As String
    Public Sub New(ByVal first_name As String, ByVal last_name As String)
        FirstName = first_name
        LastName = last_name
    End Sub
    Public Overrides Function ToString() As String
        Return FirstName & " " & LastName
    End Function
End Class

CheckedListBox.DataSource

  
Imports System.Windows.Forms
Module Module1
    Sub Main()
        Application.Run(New Form1)
    End Sub
End Module
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.ruponentModel.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 CheckedListBox1 As System.Windows.Forms.CheckedListBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckedListBox1 = New System.Windows.Forms.CheckedListBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        "
        "CheckedListBox1
        "
        Me.CheckedListBox1.Location = New System.Drawing.Point(24, 32)
        Me.CheckedListBox1.Name = "CheckedListBox1"
        Me.CheckedListBox1.Size = New System.Drawing.Size(360, 64)
        Me.CheckedListBox1.TabIndex = 0
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(152, 120)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Show Choice"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(416, 165)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.CheckedListBox1})
        Me.Name = "Form1"
        Me.Text = "CheckListBoxDemo"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Public List() As String = {"A","B","C","D"}
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        CheckedListBox1.BeginUpdate()
        CheckedListBox1.DataSource = List
        CheckedListBox1.EndUpdate()
    End Sub

    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        If (CheckedListBox1.SelectedItem <> "") Then
            Dim Entry As Object
            For Each Entry In CheckedListBox1.CheckedItems
                MessageBox.Show(Entry.ToString())
            Next
        Else
            MessageBox.Show("You must select an item")
        End If
    End Sub
End Class

CheckedListBox.EndUpdate()

  
Imports System.Windows.Forms
Module Module1
    Sub Main()
        Application.Run(New Form1)
    End Sub
End Module
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.ruponentModel.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 CheckedListBox1 As System.Windows.Forms.CheckedListBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckedListBox1 = New System.Windows.Forms.CheckedListBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        "
        "CheckedListBox1
        "
        Me.CheckedListBox1.Location = New System.Drawing.Point(24, 32)
        Me.CheckedListBox1.Name = "CheckedListBox1"
        Me.CheckedListBox1.Size = New System.Drawing.Size(360, 64)
        Me.CheckedListBox1.TabIndex = 0
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(152, 120)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Show Choice"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(416, 165)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.CheckedListBox1})
        Me.Name = "Form1"
        Me.Text = "CheckListBoxDemo"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Public List() As String = {"A","B","C","D"}
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        CheckedListBox1.BeginUpdate()
        CheckedListBox1.DataSource = List
        CheckedListBox1.EndUpdate()
    End Sub

    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        If (CheckedListBox1.SelectedItem <> "") Then
            Dim Entry As Object
            For Each Entry In CheckedListBox1.CheckedItems
                MessageBox.Show(Entry.ToString())
            Next
        Else
            MessageBox.Show("You must select an item")
        End If
    End Sub
End Class

CheckedListBox.ItemCheck

  

Imports System
Imports System.Drawing
Imports System.Windows.Forms
Public Class MainClass
   Shared Sub Main()
        Dim myform As Form = New FrmCheckedListBox()
        Application.Run(myform)
   End Sub " Main
End Class
Public Class FrmCheckedListBox
   Inherits 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
   " list of available book titles
   Friend WithEvents chklstInput As CheckedListBox
   " user selection list
   Friend WithEvents lstDisplay As ListBox
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.Container
   "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.chklstInput = New System.Windows.Forms.CheckedListBox()
      Me.lstDisplay = New System.Windows.Forms.ListBox()
      Me.SuspendLayout()
      "
      "chklstInput
      "
      Me.chklstInput.HorizontalScrollbar = True
      Me.chklstInput.Items.AddRange(New Object() {"C++", "Java", "VB", "C#", "Perl", "Python HTP", "C", "SQL"})
      Me.chklstInput.Location = New System.Drawing.Point(16, 16)
      Me.chklstInput.Name = "chklstInput"
      Me.chklstInput.Size = New System.Drawing.Size(152, 124)
      Me.chklstInput.TabIndex = 1
      "
      "lstDisplay
      "
      Me.lstDisplay.Anchor = (System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Right)
      Me.lstDisplay.HorizontalScrollbar = True
      Me.lstDisplay.Location = New System.Drawing.Point(184, 16)
      Me.lstDisplay.Name = "lstDisplay"
      Me.lstDisplay.Size = New System.Drawing.Size(128, 121)
      Me.lstDisplay.TabIndex = 2
      "
      "FrmCheckedListBox
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(328, 157)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lstDisplay, Me.chklstInput})
      Me.Name = "FrmCheckedListBox"
      Me.Text = "Checked List Box Test"
      Me.ResumeLayout(False)
   End Sub
#End Region
   Private Sub chklstInput_ItemCheck _
      (ByVal sender As System.Object, _
      ByVal e As System.Windows.Forms.ItemCheckEventArgs) _
      Handles chklstInput.ItemCheck
      Dim item As String = chklstInput.SelectedItem
      If e.NewValue = CheckState.Checked Then
         lstDisplay.Items.Add(item)
      Else
         lstDisplay.Items.Remove(item)
      End If
   End Sub
End Class

CheckedListBox.Items.Add

  

Imports System.Windows.Forms

public class CheckedListBoxAddObjects
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Private Sub Form1_Load(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles MyBase.Load
     
        Me.clbEmployees = New System.Windows.Forms.CheckedListBox
        Me.btnListSelections = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "clbEmployees
        "
        Me.clbEmployees.FormattingEnabled = True
        Me.clbEmployees.Location = New System.Drawing.Point(8, 8)
        Me.clbEmployees.Name = "clbEmployees"
        Me.clbEmployees.Size = New System.Drawing.Size(160, 123)
        Me.clbEmployees.TabIndex = 0
        "
        "btnListSelections
        "
        Me.btnListSelections.Location = New System.Drawing.Point(8, 152)
        Me.btnListSelections.Name = "btnListSelections"
        Me.btnListSelections.Size = New System.Drawing.Size(160, 23)
        Me.btnListSelections.TabIndex = 1
        Me.btnListSelections.Text = "List Selections"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(180, 187)
        Me.Controls.Add(Me.btnListSelections)
        Me.Controls.Add(Me.clbEmployees)
        Me.Name = "Form1"
        Me.Text = "UseCheckedListBox"
        Me.ResumeLayout(False)
     
        clbEmployees.Items.Add(New Employee("A", "A"), True)
        clbEmployees.Items.Add(New Employee("B", "B"), False)
        clbEmployees.Items.Add(New Employee("C", "C"), CheckState.Indeterminate)
    End Sub
    Private Sub btnListSelections_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnListSelections.Click
        Dim checked_items As CheckedListBox.CheckedItemCollection = clbEmployees.CheckedItems
        Console.WriteLine("Selected Employees:")
        For Each item As Object In checked_items
            Console.WriteLine(item.ToString)
        Next item
    End Sub
    Friend WithEvents clbEmployees As System.Windows.Forms.CheckedListBox
    Friend WithEvents btnListSelections As System.Windows.Forms.Button
End Class
Public Class Employee
    Public FirstName As String
    Public LastName As String
    Public Sub New(ByVal first_name As String, ByVal last_name As String)
        FirstName = first_name
        LastName = last_name
    End Sub
    Public Overrides Function ToString() As String
        Return FirstName & " " & LastName
    End Function
End Class

CheckedListBox.SelectedItem

  
Imports System.Windows.Forms
Module Module1
    Sub Main()
        Application.Run(New Form1)
    End Sub
End Module
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.ruponentModel.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 CheckedListBox1 As System.Windows.Forms.CheckedListBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckedListBox1 = New System.Windows.Forms.CheckedListBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        "
        "CheckedListBox1
        "
        Me.CheckedListBox1.Location = New System.Drawing.Point(24, 32)
        Me.CheckedListBox1.Name = "CheckedListBox1"
        Me.CheckedListBox1.Size = New System.Drawing.Size(360, 64)
        Me.CheckedListBox1.TabIndex = 0
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(152, 120)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Show Choice"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(416, 165)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.CheckedListBox1})
        Me.Name = "Form1"
        Me.Text = "CheckListBoxDemo"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Public List() As String = {"A","B","C","D"}
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        CheckedListBox1.BeginUpdate()
        CheckedListBox1.DataSource = List
        CheckedListBox1.EndUpdate()
    End Sub

    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        If (CheckedListBox1.SelectedItem <> "") Then
            Dim Entry As Object
            For Each Entry In CheckedListBox1.CheckedItems
                MessageBox.Show(Entry.ToString())
            Next
        Else
            MessageBox.Show("You must select an item")
        End If
    End Sub
End Class