Why does RESIDENT script work but INJECTED script fails?

I've got a FRAME based application. I'm trying to exit frames and return to a NON frame page. So, from one frame, I want to execute ... parent.top.location.href = "whatever.aspx"

Approach 1 works great, entire page is replaced by no-frames page.

=========================================
Approach 1
=========================================
<script>
    function closeFrames()
    {
    parent.top.location.href = "login.aspx";
    }
</script>
=========================================

But Approach 1 must be triggered from inside the markup, which is no good because, I need to do some "cleanup" before the page goes away. So, I need to trigger from code-behind and I try Approach 2,3,4,5 from code behind ... all FOUR approaches  DO load "whatever.aspx" ... BUT ... load ONLY into the frame and NOT THE ENTIRE PAGE!

=========================================
Approach 2 - wrap javascript in script tags
=========================================
    Dim sb As StringBuilder = New StringBuilder()
    sb.Append("<script>")
    sb.Append(vbCrLf)
    sb.Append("parent.top.location.href = ")
    sb.Append(Chr(34))
    sb.Append("whatever.aspx")
    sb.Append(Chr(34))
    sb.Append(";")
    sb.Append(vbCrLf)
    sb.Append("</script>")
    sb.Append(vbCrLf)
    Response.Clear()
    Response.Write(sb.ToString())
    Response.Flush()
=========================================
Approach 3 - call resident javascript from inside script tags
=========================================
    Dim sb As StringBuilder = New StringBuilder()
    sb.Append("<script>")
    sb.Append(vbCrLf)
    sb.Append("closeFrames();")
    sb.Append(vbCrLf)
    sb.Append("</script>")
    sb.Append(vbCrLf)
    Response.Clear()
    Response.Write(sb.ToString())
    Response.Flush()
=========================================
Approach 4 - call resident without script tags
=========================================
    Dim sb As StringBuilder = New StringBuilder()
    sb.Append("closeFrames();")
    Response.Clear()
    Response.Write(sb.ToString())
    Response.Flush()
=========================================
Approach 5 - call javascript literally!
=========================================
    sb.Append("parent.top.location.href = ")
    sb.Append(Chr(34))
    sb.Append("whatever.aspx")
    sb.Append(Chr(34))
    sb.Append(";")
    sb.Append(vbCrLf)
=========================================

I've tried every trick I can think of ... can anyone help?
How do I trigger a NON-FRAME page load from a frame's Code-Behind?