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

CheckState.Checked

  

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
    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
    Public Sub New()
        MyBase.New()
        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
    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

CheckState.Indeterminate

  
Imports System.Windows.Forms
Module Module1
    Sub Main()
        Application.Run(New Form1)
    End Sub
End Module


Public Class Form1
    Inherits System.Windows.Forms.Form
    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
    Public Sub New()
        MyBase.New()
        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
    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