CheckState.Checked : CheckState « System.Windows.Forms « VB.Net by API

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
Related examples in the same category

CheckState.Indeterminate