ウィンドウハンドルを取得するタイミングについて

    [System.STAThread()]
    public static void Main(string[] cmdArgs) {
        Application.Idle += new EventHandler(Application_Idle);
        Application.Run(new FormMain());
    }

    private static void Application_Idle(object sender, EventArgs e) {
        System.IntPtr mainWindowHandle = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;

        MessageBox.Show("ハンドル = " + mainWindowHandle.ToString());

        Application.Idle -= new EventHandler(Application_Idle);
    }

    <System.STAThread()> _
    Public Shared Sub Main()
        AddHandler Application.Idle, AddressOf Application_Idle
        Application.Run(New Form1())
    End Sub

    Private Shared Sub Application_Idle(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim mainWindowHandle As System.IntPtr = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle

        MessageBox.Show("ハンドル = " & mainWindowHandle.ToString())

        RemoveHandler Application.Idle, AddressOf Application_Idle
    End Sub

Private Sub Dialog1_Load(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles Me.Load
    Me.Text = Me.Handle.ToString()
End Sub