Private Sub InitializeMyListBox()
   ' Add items to the ListBox.
   listBox1.Items.Add("A")
   listBox1.Items.Add("C")
   listBox1.Items.Add("E")
   listBox1.Items.Add("F")
   listBox1.Items.Add("G")
   listBox1.Items.Add("D")
   listBox1.Items.Add("B")

   ' Sort all items added previously.
   listBox1.Sorted = True

   ' Set the SelectionMode to select multiple items.
   listBox1.SelectionMode = SelectionMode.MultiExtended

   ' Select three initial items from the list.
   listBox1.SetSelected(0, True)
   listBox1.SetSelected(2, True)
   listBox1.SetSelected(4, True)

   ' Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex = 0
End Sub

Private Sub InvertMySelection()

   Dim x As Integer
   ' Loop through all items the ListBox.
   For x = 0 To listBox1.Items.Count - 1

      ' Determine if the item is selected.
      If listBox1.GetSelected(x) = True Then
         ' Deselect all items that are selected.
         listBox1.SetSelected(x, False)
      Else
         ' Select all items that are not selected.
         listBox1.SetSelected(x, True)
      End If
   Next x
   ' Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex = 0
End Sub

' 导入命名空间
Imports System
Imports System.Drawing
Imports System.Reflection
Imports System.Windows.Forms

public class MainClass

   Shared Sub Main()
      Dim form1 As Form = New Form1
      Application.Run(form1)
   End Sub

End Class




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
    Friend WithEvents listBox1 As System.Windows.Forms.ListBox
    Friend WithEvents chkMulti As System.Windows.Forms.CheckBox
    Friend WithEvents lblWindow As System.Windows.Forms.Label

    '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.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.chkMulti = New System.Windows.Forms.CheckBox()
        Me.lblWindow = New System.Windows.Forms.Label()
        Me.listBox1 = New System.Windows.Forms.ListBox()
        Me.SuspendLayout()
        '
        'chkMulti
        '
        Me.chkMulti.Location = New System.Drawing.Point(192, 64)
        Me.chkMulti.Name = "chkMulti"
        Me.chkMulti.Size = New System.Drawing.Size(80, 16)
        Me.chkMulti.TabIndex = 1
        Me.chkMulti.Text = "MultiSelect"
        '
        'lblWindow
        '
        Me.lblWindow.Location = New System.Drawing.Point(32, 192)
        Me.lblWindow.Name = "lblWindow"
        Me.lblWindow.Size = New System.Drawing.Size(232, 16)
        Me.lblWindow.TabIndex = 2
        '
        'listBox1
        '
        Me.listBox1.Location = New System.Drawing.Point(24, 24)
        Me.listBox1.Name = "listBox1"
        Me.listBox1.Size = New System.Drawing.Size(144, 160)
        Me.listBox1.TabIndex = 0
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 216)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblWindow, Me.chkMulti, Me.listBox1})
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub


#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim x As Integer
        For x = 1 To 20
            listBox1().Items.Add("Entry # " & CStr(x))
        Next
    End Sub

    Private Sub chkMulti_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkMulti.CheckedChanged
        If chkMulti().CheckState = CheckState.Checked Then
            listBox1().SelectionMode = SelectionMode.MultiExtended
        Else
            listBox1().SelectionMode = SelectionMode.One
        End If
    End Sub

End Class