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

CheckState.Checked

<source lang="vbnet">

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

 </source>

CheckState.Indeterminate

<source lang="vbnet"> 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

 </source>