Shared x As Integer = 200
Shared y As Integer = 200

Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click

    ' Create a new Form1 and set its Visible property to true.
    Dim form2 As New Form1
    form2.Visible = True

    ' Set the new form's desktop location so it appears below and 
    ' to the right of the current form.
    form2.SetDesktopLocation(x, y)
    x += 30
    y += 30

    ' Keep the current form active by calling the Activate method.
    Me.Activate()
    Me.Button1.Enabled = False
End Sub



' Updates the label text to reflect the current values of x and y, 
' which was were incremented in the Button1 control's click event.
Private Sub Form1_Activated(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles MyBase.Activated
    Label1.Text = "x: " & x & " y: " & y
    Label2.Text = "Number of forms currently open: " & count
End Sub

Shared count As Integer = 0

Private Sub Form1_Closed(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles MyBase.Closed
    count -= 1
End Sub

Private Sub Form1_Load(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles MyBase.Load
    count += 1
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 CheckedListBox1 As System.Windows.Forms.CheckedListBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.CheckedListBox1 = New System.Windows.Forms.CheckedListBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'CheckedListBox1
        '
        Me.CheckedListBox1.Location = New System.Drawing.Point(24, 32)
        Me.CheckedListBox1.Name = "CheckedListBox1"
        Me.CheckedListBox1.Size = New System.Drawing.Size(360, 64)
        Me.CheckedListBox1.TabIndex = 0
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(152, 120)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Show Choice"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(416, 165)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.CheckedListBox1})
        Me.Name = "Form1"
        Me.Text = "CheckListBoxDemo"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Public List() As String = {"A","B","C","D"}

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        CheckedListBox1.BeginUpdate()
        CheckedListBox1.DataSource = List
        CheckedListBox1.EndUpdate()
    End Sub


    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        If (CheckedListBox1.SelectedItem <> "") Then
            Dim Entry As Object
            For Each Entry In CheckedListBox1.CheckedItems
                MessageBox.Show(Entry.ToString())
            Next
        Else
            MessageBox.Show("You must select an item")
        End If
    End Sub

End Class