Imports System.Runtime.InteropServices
Public Class Form1
    Inherits System.Windows.Forms.Form
    <DllImport("user32.dll")> _
    Private Shared Function SendMessage( _
       ByVal hWnd As IntPtr, _
       ByVal wMsg As Int32, _
       ByVal wParam As Int32, _
       ByRef lParam As Int32) _
       As Int32
    End Function
    Const WM_KEYDOWN As Integer = &H100
    Dim x As IntPtr
 
#Region " Vom Windows Form Designer generierter Code "
 
    Public Sub New()
        MyBase.New()
 
        ' Dieser Aufruf ist für den Windows Form-Designer erforderlich.
        InitializeComponent()
 
        ' Initialisierungen nach dem Aufruf InitializeComponent() hinzufügen
 
    End Sub
 
    ' Die Form überschreibt den Löschvorgang der Basisklasse, um Komponenten zu 
    ' bereinigen.
    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
 
    ' Für Windows Form-Designer erforderlich
    Private components As System.ComponentModel.IContainer
 
    'HINWEIS: Die folgende Prozedur ist für den Windows Form-Designer 
    ' erforderlich
    'Sie kann mit dem Windows Form-Designer modifiziert werden.
    'Verwenden Sie nicht den Code-Editor zur Bearbeitung.
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(128, 96)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(56, 40)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Button1"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.Button1)
        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
 
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Button1.Click
        x = New IntPtr(&HFFFF)
        SendMessage(x, WM_KEYDOWN, 0, 0)
 
    End Sub
End Class