VB.Net Tutorial/GUI/CheckBox

Add objects to CheckedListBox

Imports System.Windows.Forms

public class CheckedListBoxAddObjects
   public Shared Sub Main
        Application.Run(New 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
        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
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
<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.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)
    End Sub
    Friend WithEvents clbEmployees As System.Windows.Forms.CheckedListBox
    Friend WithEvents btnListSelections As System.Windows.Forms.Button
End Class

CheckBox Check States

Imports System.Windows.Forms
public class CheckBoxSelectedState
   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
    Friend WithEvents checkBoxA As System.Windows.Forms.CheckBox
    Friend WithEvents checkBoxB As System.Windows.Forms.CheckBox
    Friend WithEvents btnStatus As System.Windows.Forms.Button
    Friend WithEvents btnEnable As System.Windows.Forms.Button
    "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.checkBoxA = New System.Windows.Forms.CheckBox()
        Me.checkBoxB = New System.Windows.Forms.CheckBox()
        Me.btnStatus = New System.Windows.Forms.Button()
        Me.btnEnable = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        "
        "checkBoxA
        "
        Me.checkBoxA.Checked = True
        Me.checkBoxA.CheckState = System.Windows.Forms.CheckState.Checked
        Me.checkBoxA.Location = New System.Drawing.Point(48, 72)
        Me.checkBoxA.Name = "checkBoxA"
        Me.checkBoxA.Size = New System.Drawing.Size(200, 24)
        Me.checkBoxA.TabIndex = 0
        Me.checkBoxA.Text = "CheckBox A"
        "
        "checkBoxB
        "
        Me.checkBoxB.AutoCheck = False
        Me.checkBoxB.Checked = True
        Me.checkBoxB.CheckState = System.Windows.Forms.CheckState.Indeterminate
        Me.checkBoxB.Location = New System.Drawing.Point(48, 120)
        Me.checkBoxB.Name = "checkBoxB"
        Me.checkBoxB.Size = New System.Drawing.Size(200, 24)
        Me.checkBoxB.TabIndex = 1
        Me.checkBoxB.Text = "CheckBox B"
        Me.checkBoxB.ThreeState = True
        "
        "btnStatus
        "
        Me.btnStatus.Anchor = (System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right)
        Me.btnStatus.Location = New System.Drawing.Point(56, 192)
        Me.btnStatus.Name = "btnStatus"
        Me.btnStatus.Size = New System.Drawing.Size(136, 23)
        Me.btnStatus.TabIndex = 2
        Me.btnStatus.Text = "View Checkbox Status"
        "
        "btnEnable
        "
        Me.btnEnable.Anchor = (System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right)
        Me.btnEnable.Location = New System.Drawing.Point(224, 192)
        Me.btnEnable.Name = "btnEnable"
        Me.btnEnable.Size = New System.Drawing.Size(96, 23)
        Me.btnEnable.TabIndex = 3
        Me.btnEnable.Text = "Enable"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(368, 266)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.btnEnable, Me.btnStatus, Me.checkBoxB, Me.checkBoxA})
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub btnStatus_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles btnStatus.Click
        Dim status As String
        If checkBoxA.Checked = True Then
         status = "checkBoxA is checked. " & ControlChars.Cr
        Else
         status = "checkBoxA is unchecked. " & ControlChars.Cr
        End If
        If checkBoxB.ThreeState = True Then
            status = status & "checkBoxB"s CheckState is " & checkBoxB.CheckState.ToString() & "."
        Else
            If checkBoxB.Checked = True Then
                status = status & "checkBoxB is checked."
            Else
                status = status & "checkBoxB is unchecked."
            End If
        End If
      MessageBox.Show(status)
    End Sub
    Private Sub btnEnable_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles btnEnable.Click
        checkBoxB.AutoCheck = True
        checkBoxB.CheckState = CheckState.Checked
        checkBoxB.ThreeState = False
    End Sub
End Class

CheckBox check/uncheck event

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class CheckBoxCheckEvent
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents CheckBox1 As System.Windows.Forms.CheckBox
    Friend WithEvents CheckBox2 As System.Windows.Forms.CheckBox
    Friend WithEvents CheckBox3 As System.Windows.Forms.CheckBox
    Friend WithEvents CheckBox4 As System.Windows.Forms.CheckBox
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents CheckBox5 As System.Windows.Forms.CheckBox
    Friend WithEvents CheckBox6 As System.Windows.Forms.CheckBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckBox1 = New System.Windows.Forms.CheckBox
        Me.CheckBox2 = New System.Windows.Forms.CheckBox
        Me.CheckBox3 = New System.Windows.Forms.CheckBox
        Me.CheckBox4 = New System.Windows.Forms.CheckBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.CheckBox5 = New System.Windows.Forms.CheckBox
        Me.CheckBox6 = New System.Windows.Forms.CheckBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        "
        "CheckBox1
        "
        Me.CheckBox1.Location = New System.Drawing.Point(24, 64)
        Me.CheckBox1.Name = "CheckBox1"
        Me.CheckBox1.TabIndex = 0
        Me.CheckBox1.Text = "CheckBox1"
        "
        "CheckBox2
        "
        Me.CheckBox2.Location = New System.Drawing.Point(152, 64)
        Me.CheckBox2.Name = "CheckBox2"
        Me.CheckBox2.TabIndex = 1
        Me.CheckBox2.Text = "CheckBox2"
        "
        "CheckBox3
        "
        Me.CheckBox3.Location = New System.Drawing.Point(24, 120)
        Me.CheckBox3.Name = "CheckBox3"
        Me.CheckBox3.TabIndex = 2
        Me.CheckBox3.Text = "CheckBox3"
        "
        "CheckBox4
        "
        Me.CheckBox4.Location = New System.Drawing.Point(152, 120)
        Me.CheckBox4.Name = "CheckBox4"
        Me.CheckBox4.TabIndex = 3
        Me.CheckBox4.Text = "CheckBox4"
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(32, 232)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(216, 20)
        Me.TextBox1.TabIndex = 4
        Me.TextBox1.Text = "TextBox1"
        "
        "CheckBox5
        "
        Me.CheckBox5.Location = New System.Drawing.Point(24, 176)
        Me.CheckBox5.Name = "CheckBox5"
        Me.CheckBox5.TabIndex = 5
        Me.CheckBox5.Text = "CheckBox5"
        "
        "CheckBox6
        "
        Me.CheckBox6.Location = New System.Drawing.Point(152, 176)
        Me.CheckBox6.Name = "CheckBox6"
        Me.CheckBox6.TabIndex = 6
        Me.CheckBox6.Text = "CheckBox6"
        "
        "Label1
        "
        Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 24.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(0, 0)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(208, 48)
        Me.Label1.TabIndex = 7
        Me.Label1.Text = "Check Boxes"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.CheckBox6)
        Me.Controls.Add(Me.CheckBox5)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.CheckBox4)
        Me.Controls.Add(Me.CheckBox3)
        Me.Controls.Add(Me.CheckBox2)
        Me.Controls.Add(Me.CheckBox1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
    Private Sub CheckBox1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged
        If CheckBox1.Checked Then
            TextBox1.Text = "Check box 1 is checked."
        Else
            TextBox1.Text = "Check box 1 is not checked."
        End If
    End Sub
    Private Sub CheckBox2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox2.CheckedChanged
        If CheckBox2.Checked Then
            TextBox1.Text = "Check box 2 is checked."
        Else
            TextBox1.Text = "Check box 2 is not checked."
        End If
    End Sub
    Private Sub CheckBox3_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox3.CheckedChanged
        If CheckBox3.Checked Then
            TextBox1.Text = "Check box 3 is checked."
        Else
            TextBox1.Text = "Check box 3 is not checked."
        End If
    End Sub
    Private Sub CheckBox4_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox4.CheckedChanged
        If CheckBox4.Checked Then
            TextBox1.Text = "Check box 4 is checked."
        Else
            TextBox1.Text = "Check box 4 is not checked."
        End If
    End Sub
    Private Sub CheckBox5_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox5.CheckedChanged
        If CheckBox5.Checked Then
            TextBox1.Text = "Check box 5 is checked."
        Else
            TextBox1.Text = "Check box 5 is not checked."
        End If
    End Sub
    Private Sub CheckBox6_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox6.CheckedChanged
        If CheckBox6.Checked Then
            TextBox1.Text = "Check box 6 is checked."
        Else
            TextBox1.Text = "Check box 6 is not checked."
        End If
    End Sub
End Class

CheckBox with three states

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class CheckBoxThreeStates
   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 CheckBox1 As System.Windows.Forms.CheckBox
    Friend WithEvents CheckBox2 As System.Windows.Forms.CheckBox
    Friend WithEvents CheckBox3 As System.Windows.Forms.CheckBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckBox1 = New System.Windows.Forms.CheckBox
        Me.CheckBox2 = New System.Windows.Forms.CheckBox
        Me.CheckBox3 = New System.Windows.Forms.CheckBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        "
        "CheckBox1
        "
        Me.CheckBox1.Location = New System.Drawing.Point(88, 64)
        Me.CheckBox1.Name = "CheckBox1"
        Me.CheckBox1.TabIndex = 0
        Me.CheckBox1.Text = "Unchecked"
        "
        "CheckBox2
        "
        Me.CheckBox2.Checked = True
        Me.CheckBox2.CheckState = System.Windows.Forms.CheckState.Checked
        Me.CheckBox2.Location = New System.Drawing.Point(88, 120)
        Me.CheckBox2.Name = "CheckBox2"
        Me.CheckBox2.TabIndex = 1
        Me.CheckBox2.Text = "Checked"
        "
        "CheckBox3
        "
        Me.CheckBox3.Checked = True
        Me.CheckBox3.CheckState = System.Windows.Forms.CheckState.Indeterminate
        Me.CheckBox3.Location = New System.Drawing.Point(88, 176)
        Me.CheckBox3.Name = "CheckBox3"
        Me.CheckBox3.TabIndex = 2
        Me.CheckBox3.Text = "Indeterminate"
        Me.CheckBox3.ThreeState = True
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(272, 229)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.CheckBox3)
        Me.Controls.Add(Me.CheckBox2)
        Me.Controls.Add(Me.CheckBox1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
End Class

Using CheckBoxes to toggle italic and bold styles

Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
public class CheckBoxEvent
   public Shared Sub Main
        Application.Run(New FrmCheckBox)
   End Sub
End class

Public Class FrmCheckBox
   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
   Friend WithEvents chkItalic As System.Windows.Forms.CheckBox
   Friend WithEvents lblOutput As System.Windows.Forms.Label
   Friend WithEvents chkBold As System.Windows.Forms.CheckBox
   "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.lblOutput = New System.Windows.Forms.Label()
      Me.chkItalic = New System.Windows.Forms.CheckBox()
      Me.chkBold = New System.Windows.Forms.CheckBox()
      Me.SuspendLayout()
      "
      "lblOutput
      "
      Me.lblOutput.Font = New System.Drawing.Font("Microsoft Sans Serif", 11.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
      Me.lblOutput.Location = New System.Drawing.Point(48, 24)
      Me.lblOutput.Name = "lblOutput"
      Me.lblOutput.Size = New System.Drawing.Size(208, 24)
      Me.lblOutput.TabIndex = 0
      Me.lblOutput.Text = "Watch the font style change"
      "
      "chkItalic
      "
      Me.chkItalic.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
      Me.chkItalic.Location = New System.Drawing.Point(152, 64)
      Me.chkItalic.Name = "chkItalic"
      Me.chkItalic.Size = New System.Drawing.Size(64, 24)
      Me.chkItalic.TabIndex = 2
      Me.chkItalic.Text = "Italic"
      "
      "chkBold
      "
      Me.chkBold.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
      Me.chkBold.Location = New System.Drawing.Point(80, 64)
      Me.chkBold.Name = "chkBold"
      Me.chkBold.Size = New System.Drawing.Size(56, 24)
      Me.chkBold.TabIndex = 1
      Me.chkBold.Text = "Bold"
      "
      "FrmCheckBox
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
      Me.ClientSize = New System.Drawing.Size(292, 117)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.chkItalic, Me.chkBold, Me.lblOutput})
      Me.Font = New System.Drawing.Font("Microsoft Sans Serif", 9!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
      Me.Name = "FrmCheckBox"
      Me.Text = "CheckBoxTest"
      Me.ResumeLayout(False)
   End Sub
#End Region
   Private Sub chkItalic_CheckedChanged _
      (ByVal sender As System.Object, ByVal e As System.EventArgs) _
      Handles chkItalic.CheckedChanged
      lblOutput.Font = New Font("Microsoft Sans Serif", _
         lblOutput.Font.Size, lblOutput.Font.Style Xor FontStyle.Italic)
   End Sub 
   Private Sub chkBold_CheckedChanged _
      (ByVal sender As System.Object, ByVal e As System.EventArgs) _
      Handles chkBold.CheckedChanged
      lblOutput.Font = New Font("Microsoft Sans Serif", _
         lblOutput.Font.Size, lblOutput.Font.Style Xor FontStyle.Bold)
   End Sub 
End Class