Protected domainUpDown1 As DomainUpDown


Private Sub MySub()
    ' Create and initialize the DomainUpDown control.
    domainUpDown1 = New System.Windows.Forms.DomainUpDown()
    
    ' Add the DomainUpDown control to the form.
    Controls.Add(domainUpDown1)
End Sub


Private Sub button1_Click(sender As System.Object, e As System.EventArgs)
    ' Add the text box contents and initial location in the collection
    ' to the DomainUpDown control.
    domainUpDown1.Items.Add((textBox1.Text.Trim() & " - " & myCounter))
    
    ' Increment the counter variable.
    myCounter = myCounter + 1
    
    ' Clear the TextBox.
    textBox1.Text = ""
End Sub


Private Sub checkBox1_Click(sender As System.Object, e As System.EventArgs)
    ' If Sorted is set to true, set it to false; 
    ' otherwise set it to true.
    If domainUpDown1.Sorted Then
        domainUpDown1.Sorted = False
    Else
        domainUpDown1.Sorted = True
    End If
End Sub


Private Sub domainUpDown1_SelectedItemChanged _
    (sender As System.Object, e As System.EventArgs)
    
    ' Display the SelectedIndex and SelectedItem property values in a MessageBox.
    MessageBox.Show(("SelectedIndex: " & domainUpDown1.SelectedIndex.ToString() & _
        ControlChars.Cr & "SelectedItem: " & domainUpDown1.SelectedItem.ToString()))
End Sub

' 导入命名空间
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.ComponentModel.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 DomainUpDown1 As System.Windows.Forms.DomainUpDown
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.DomainUpDown1 = New System.Windows.Forms.DomainUpDown()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'DomainUpDown1
        '
        Me.DomainUpDown1.Items.Add("A")
        Me.DomainUpDown1.Items.Add("B")
        Me.DomainUpDown1.Items.Add("C")
        Me.DomainUpDown1.Items.Add("D")
        Me.DomainUpDown1.Items.Add("E")
        Me.DomainUpDown1.Items.Add("F")
        Me.DomainUpDown1.Items.Add("G")
        Me.DomainUpDown1.Items.Add("")
        Me.DomainUpDown1.Location = New System.Drawing.Point(16, 24)
        Me.DomainUpDown1.Name = "DomainUpDown1"
        Me.DomainUpDown1.TabIndex = 0
        Me.DomainUpDown1.Text = "Select a value"
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(112, 72)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Done"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(296, 117)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.DomainUpDown1})
        Me.Name = "Form1"
        Me.Text = "DomainUpDownDemo"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        If (DomainUpDown1.SelectedItem = "") Then
            MessageBox.Show("You must select a value")
        Else
            MessageBox.Show("You choose: " & DomainUpDown1.SelectedItem)
        End If
    End Sub
End Class