How to leave an iFrame when I finish my job.

Public Sub ChangePage(sender As Object, e As EventArgs)
        Dim myNewAsp As New AspNetSqlProvider
        Dim dbHandler As New DBHandler
        Dim srvHandler As New ServerHandler
        Dim aspProvider As New MyAspNetSqlMembershipProvider
        Dim errAnswer As New Register
        Dim assit As New Assistance
        Dim currentUser As MembershipUser = Nothing
        Dim message As String = Nothing
        Dim msg As String = Nothing
        Try
            Dim url As String = "/Pages/Account/Login.aspx"
            Dim postWindow As Object   ' "/Pages/Account/Assistance.aspx"
            Dim startWindow As Object   ' "/Pages/Support/Asp/Help01.aspx"
            Dim urlURI As String = HttpContext.Current.Request.Url.AbsoluteUri
            Dim urlPath As String = HttpContext.Current.Request.Url.AbsolutePath
            Dim myServerName As String = Strings.Left(urlURI, urlURI.Length - urlPath.Length)
            url = myServerName + url
            startWindow = Me.GetType().FullName
            postWindow = Assistance.PageUrlType
            msg = "<script type='text/javascript'> $(document).ready(function(){  window.location.href='" + url + "';  }); </script>"
            Dim script As Type = Me.Page.GetType()  '  Assistance.PageType.BaseType
            Dim postmsg As String = "ChangePage('" & startWindow & "', '" & postWindow & "', '" & msg & "')"
            If Not Page.ClientScript.IsStartupScriptRegistered(Me.GetType(), "sendMessage") Then
                Page.ClientScript.RegisterStartupScript(script, "sendMessage", postmsg, False)
            End If

        Catch eq As SqlException
            srvHandler.ErrorAnswer = DBHandler.GetError(1, Nothing, Nothing, eq, Nothing)
            srvHandler.ErrorAnswer = srvHandler.ErrorAnswer & "\r\n Asp.SQLProvider.ResetPassword "
            ServerHandler._InnerError += srvHandler.ErrorAnswer
            Register.errorCall = True
            Return
        Catch Ex As Exception
            srvHandler.ErrorAnswer = DBHandler.GetError(3, Ex, Nothing, Nothing, Nothing)
            srvHandler.ErrorAnswer = srvHandler.ErrorAnswer & "\r\n Asp.SQLProvider.ResetPassword"
            ServerHandler._InnerError += srvHandler.ErrorAnswer
            Register.errorCall = True
            Return

        End Try
End Sub

Public WithEvents iFrame As System.Web.UI.HtmlControls.HtmlGenericControl

Public Shared _PageUrlType As Object
    Public Shared Property PageUrlType() As Object
        Get
            Return _PageUrlType
        End Get
        Set(value As Object)
            _PageUrlType = value
        End Set
    End Property
    Public Shared _PageType As Type
    Public Shared Property PageType() As Type
        Get
            Return _PageType
        End Get
        Set(value As Type)
            _PageType = value
        End Set
    End Property

<script type="text/javascript">
     function ChangePage(startPage, sendPage, message) {
         var sPage = document.getElementById(sendPage);
         sPage.contentWindow.postMessage(message, startPage);
     }
    </script>

<script type="text/javascript">
    window.addEventListener("message", receiveMessage, false);
    function receiveMessage(event) {
        event.origin !== message;
        event.source.postMessage("'" + message + "'", event.origin);
            return;
    }
</script>