VB.Net Tutorial/GUI/CheckedListBox

Add value to Checked List Box

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class CheckBoxListAddValueSelectionEvent
   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 CheckedListBox1 As System.Windows.Forms.CheckedListBox
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckedListBox1 = New System.Windows.Forms.CheckedListBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        "
        "CheckedListBox1
        "
        Me.CheckedListBox1.CheckOnClick = True
        Me.CheckedListBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.CheckedListBox1.Location = New System.Drawing.Point(96, 6)
        Me.CheckedListBox1.Name = "CheckedListBox1"
        Me.CheckedListBox1.Size = New System.Drawing.Size(120, 150)
        Me.CheckedListBox1.TabIndex = 0
        "
        "TextBox1
        "
        Me.TextBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox1.Location = New System.Drawing.Point(16, 184)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(296, 20)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = "TextBox1"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(15, 37)
        Me.ClientSize = New System.Drawing.Size(336, 229)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.CheckedListBox1)
        Me.Font = New System.Drawing.Font("Microsoft Sans Serif", 24.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        CheckedListBox1.Items.Add("Item 1", True)
        CheckedListBox1.Items.Add("Item 2", True)
        CheckedListBox1.Items.Add("Item 3", True)
        CheckedListBox1.Items.Add("Item 4", False)
        CheckedListBox1.Items.Add("Item 5", True)
        CheckedListBox1.Items.Add("Item 6", True)
        CheckedListBox1.Items.Add("Item 7", True)
        CheckedListBox1.Items.Add("Item 8", False)
        CheckedListBox1.Items.Add("Item 9", True)
        CheckedListBox1.Items.Add("Item 10", True)
        CheckedListBox1.Items.Add("Item 11", True)
    End Sub
    Private Sub CheckedListBox1_ItemCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles CheckedListBox1.ItemCheck
        Select Case e.NewValue
            Case CheckState.Checked
                TextBox1.Text = "You checked Item " & e.Index
            Case CheckState.Unchecked
                TextBox1.Text = "You unchecked Item " & e.Index
        End Select
    End Sub
End Class

CheckedListBox: Add Items, Get Selected Items and Get Selected Indices

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

Checked List Box selection event

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class CheckBoxListAddValueSelectionEvent
   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 CheckedListBox1 As System.Windows.Forms.CheckedListBox
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckedListBox1 = New System.Windows.Forms.CheckedListBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        "
        "CheckedListBox1
        "
        Me.CheckedListBox1.CheckOnClick = True
        Me.CheckedListBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.CheckedListBox1.Location = New System.Drawing.Point(96, 6)
        Me.CheckedListBox1.Name = "CheckedListBox1"
        Me.CheckedListBox1.Size = New System.Drawing.Size(120, 150)
        Me.CheckedListBox1.TabIndex = 0
        "
        "TextBox1
        "
        Me.TextBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox1.Location = New System.Drawing.Point(16, 184)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(296, 20)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = "TextBox1"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(15, 37)
        Me.ClientSize = New System.Drawing.Size(336, 229)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.CheckedListBox1)
        Me.Font = New System.Drawing.Font("Microsoft Sans Serif", 24.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        CheckedListBox1.Items.Add("Item 1", True)
        CheckedListBox1.Items.Add("Item 2", True)
        CheckedListBox1.Items.Add("Item 3", True)
        CheckedListBox1.Items.Add("Item 4", False)
        CheckedListBox1.Items.Add("Item 5", True)
        CheckedListBox1.Items.Add("Item 6", True)
        CheckedListBox1.Items.Add("Item 7", True)
        CheckedListBox1.Items.Add("Item 8", False)
        CheckedListBox1.Items.Add("Item 9", True)
        CheckedListBox1.Items.Add("Item 10", True)
        CheckedListBox1.Items.Add("Item 11", True)
    End Sub
    Private Sub CheckedListBox1_ItemCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles CheckedListBox1.ItemCheck
        Select Case e.NewValue
            Case CheckState.Checked
                TextBox1.Text = "You checked Item " & e.Index
            Case CheckState.Unchecked
                TextBox1.Text = "You unchecked Item " & e.Index
        End Select
    End Sub
End Class

Using the checked list boxes to add items to a list box

Imports System.Windows.Forms
public class CheckedListBoxAddRemove
   public Shared Sub Main
        Application.Run(New FrmCheckedListBox)
   End Sub
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() {"A", "B", "C", "D", "E", "F", "G", "H"})
      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