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 TabControl1 As System.Windows.Forms.TabControl
    Friend WithEvents TabPage1 As System.Windows.Forms.TabPage
    Friend WithEvents TabPage2 As System.Windows.Forms.TabPage
    Friend WithEvents TabPage3 As System.Windows.Forms.TabPage
    Friend WithEvents TabPage4 As System.Windows.Forms.TabPage
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox4 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TabControl1 = New System.Windows.Forms.TabControl()
        Me.TabPage1 = New System.Windows.Forms.TabPage()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.TabPage2 = New System.Windows.Forms.TabPage()
        Me.TextBox2 = New System.Windows.Forms.TextBox()
        Me.TabPage3 = New System.Windows.Forms.TabPage()
        Me.TextBox3 = New System.Windows.Forms.TextBox()
        Me.TabPage4 = New System.Windows.Forms.TabPage()
        Me.TextBox4 = New System.Windows.Forms.TextBox()
        Me.TabControl1.SuspendLayout()
        Me.TabPage1.SuspendLayout()
        Me.TabPage2.SuspendLayout()
        Me.TabPage3.SuspendLayout()
        Me.TabPage4.SuspendLayout()
        Me.SuspendLayout()
        '
        'TabControl1
        '
        Me.TabControl1.Controls.AddRange(New System.Windows.Forms.Control() {Me.TabPage1, Me.TabPage2, Me.TabPage3, Me.TabPage4})
        Me.TabControl1.Location = New System.Drawing.Point(48, 48)
        Me.TabControl1.Name = "TabControl1"
        Me.TabControl1.SelectedIndex = 0
        Me.TabControl1.Size = New System.Drawing.Size(288, 200)
        Me.TabControl1.TabIndex = 0
        '
        'TabPage1
        '
        Me.TabPage1.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox1})
        Me.TabPage1.Location = New System.Drawing.Point(4, 22)
        Me.TabPage1.Name = "TabPage1"
        Me.TabPage1.Size = New System.Drawing.Size(280, 174)
        Me.TabPage1.TabIndex = 0
        Me.TabPage1.Text = "Visual Basic .Net"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(8, 8)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(264, 160)
        Me.TextBox1.TabIndex = 0
        Me.TextBox1.Text = ""
        '
        'TabPage2
        '
        Me.TabPage2.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox2})
        Me.TabPage2.Location = New System.Drawing.Point(4, 22)
        Me.TabPage2.Name = "TabPage2"
        Me.TabPage2.Size = New System.Drawing.Size(280, 174)
        Me.TabPage2.TabIndex = 1
        Me.TabPage2.Text = "C# "
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(8, 8)
        Me.TextBox2.Multiline = True
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.Size = New System.Drawing.Size(264, 160)
        Me.TextBox2.TabIndex = 0
        Me.TextBox2.Text = ""
        '
        'TabPage3
        '
        Me.TabPage3.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox3})
        Me.TabPage3.Location = New System.Drawing.Point(4, 22)
        Me.TabPage3.Name = "TabPage3"
        Me.TabPage3.Size = New System.Drawing.Size(280, 174)
        Me.TabPage3.TabIndex = 2
        Me.TabPage3.Text = "HTML"
        '
        'TextBox3
        '
        Me.TextBox3.Location = New System.Drawing.Point(8, 8)
        Me.TextBox3.Multiline = True
        Me.TextBox3.Name = "TextBox3"
        Me.TextBox3.Size = New System.Drawing.Size(264, 160)
        Me.TextBox3.TabIndex = 0
        Me.TextBox3.Text = ""
        '
        'TabPage4
        '
        Me.TabPage4.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox4})
        Me.TabPage4.Location = New System.Drawing.Point(4, 22)
        Me.TabPage4.Name = "TabPage4"
        Me.TabPage4.Size = New System.Drawing.Size(280, 174)
        Me.TabPage4.TabIndex = 3
        Me.TabPage4.Text = "Upgrading"
        '
        'TextBox4
        '
        Me.TextBox4.Location = New System.Drawing.Point(8, 8)
        Me.TextBox4.Multiline = True
        Me.TextBox4.Name = "TextBox4"
        Me.TextBox4.Size = New System.Drawing.Size(264, 160)
        Me.TextBox4.TabIndex = 0
        Me.TextBox4.Text = ""
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(528, 389)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TabControl1})
        Me.Name = "Form1"
        Me.Text = "TabControlDemo"
        Me.TabControl1.ResumeLayout(False)
        Me.TabPage1.ResumeLayout(False)
        Me.TabPage2.ResumeLayout(False)
        Me.TabPage3.ResumeLayout(False)
        Me.TabPage4.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Form1_Activated(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Activated
        TextBox1.Text = "some text"

        TextBox2.Text = "some text"

        TextBox3.Text = "some text"

        TextBox4.Text = "some text"
    End Sub

End Class