Redirect parent window from iFrame

I have an asp.net page inside an iFrame. I want to redirect the parent page (that sits outside the iFrame) when an 开发者_如何学Pythonasp.net button on the asp.net page in the iFrame is clicked.

The asp.net button will need to do some processing before re-directing, so I guess I need to call javascript from the asp.net

just create simple ans: in javascript

<script type="text/javascript">
    function NewWindow() {
        document.forms[0].target = "_top";
    }
</script>

call it any control like button

<asp:LinkButton ID="linkbutton1" Text="Enroll Now" OnClientClick="NewWindow();" runat="server" onclick="enrol_Click"/>