VB.Net/GUI/CheckBox

Get CheckBox Selection state

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 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(24, 32)
        Me.CheckBox1.Name = "CheckBox1"
        Me.CheckBox1.TabIndex = 0
        Me.CheckBox1.Text = "Item 1 "
        Me.CheckBox1.ThreeState = True
        "
        "CheckBox2
        "
        Me.CheckBox2.Location = New System.Drawing.Point(24, 72)
        Me.CheckBox2.Name = "CheckBox2"
        Me.CheckBox2.Size = New System.Drawing.Size(136, 24)
        Me.CheckBox2.TabIndex = 1
        Me.CheckBox2.Text = "Item 2 "
        Me.CheckBox2.ThreeState = True
        "
        "CheckBox3
        "
        Me.CheckBox3.Location = New System.Drawing.Point(24, 112)
        Me.CheckBox3.Name = "CheckBox3"
        Me.CheckBox3.Size = New System.Drawing.Size(144, 24)
        Me.CheckBox3.TabIndex = 2
        Me.CheckBox3.Text = "Item 3"
        Me.CheckBox3.ThreeState = True
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(32, 176)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(224, 56)
        Me.Label1.TabIndex = 3
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label1, Me.CheckBox3, Me.CheckBox2, Me.CheckBox1})
        Me.Name = "Form1"
        Me.Text = "CheckBoxDemo"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub CheckBox1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBox1.Click, CheckBox2.Click, CheckBox3.Click
        Label1.Text = "Choices: "
        If (CheckBox1.Checked) Then
            Label1.Text = Label1.Text & " " & CheckBox1.Text
        End If
        If (CheckBox1.CheckState = CheckState.Indeterminate) Then
            Label1.Text = Label1.Text & " " & CheckBox1.Text & " (I)"
        End If
        If (CheckBox2.Checked) Then
            Label1.Text = Label1.Text & " " & CheckBox2.Text
        End If
        If (CheckBox2.CheckState = CheckState.Indeterminate) Then
            Label1.Text = Label1.Text & " " & CheckBox2.Text & " (I)"
        End If
        If (CheckBox3.Checked) Then
            Label1.Text = Label1.Text & " " & CheckBox3.Text
        End If
        If (CheckBox3.CheckState = CheckState.Indeterminate) Then
            Label1.Text = Label1.Text & " " & CheckBox3.Text & " (I)"
        End If
        Label1.Refresh()
    End Sub
End Class

Using CheckBoxes to toggle italic and bold styles

Imports System
Imports System.Drawing
Imports System.Windows.Forms
Public Class MainClass
   Shared Sub Main()
        Dim myform As Form = New FrmCheckBox()
        Application.Run(myform)
   End Sub " Main
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
   " use Xor to toggle italic, keep other styles same
   Private Sub chkItalic_CheckedChanged _
      (ByVal sender As System.Object, ByVal e As System.EventArgs) _
      Handles chkItalic.CheckedChanged
      lblOutput.Font = New Font(lblOutput.Font.Name, _
         lblOutput.Font.Size, lblOutput.Font.Style _
         Xor FontStyle.Italic)
   End Sub " chkItalic_CheckedChanged
   " use Xor to toggle bold, keep other styles same
   Private Sub chkBold_CheckedChanged _
      (ByVal sender As System.Object, ByVal e As System.EventArgs) _
      Handles chkBold.CheckedChanged
      lblOutput.Font = New Font(lblOutput.Font.Name, _
         lblOutput.Font.Size, lblOutput.Font.Style _
         Xor FontStyle.Bold)
   End Sub 
End Class