How do I read this IFRAME's hidden input value

[szlamany]

I'm using jQuery to build an IFRAME and pass some hidden input values to a Download.aspx page - jQuery code looks like this

$('<form action="'+ url +'" method="'+ (method||'post') + '" target="iframeX">'+inputs+'</form>')
          .appendTo('body').submit().remove();

The inputs variable looks like this

<input type="hidden" name="filename" value="mit-license.txt" />

And the top of the Download.aspx code behind looks like this

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim ctx As HttpContext = HttpContext.Current
        Dim response As HttpResponse = ctx.Response
        Dim sFile As String = "mit-license.txt" ' Request.QueryString("filename").ToString

        ' Buffer to read 10K bytes in chunk:
        Dim buffer(10000) As Byte

        ' Length of the file:
        Dim length As Integer

        ' Total bytes to read:
        Dim dataToRead As Long

        ' Identify the file to download including its path.
        Dim filepath As String = "D:\ACS Desktop\AWC\" + sFile

I could not find the INPUT value - where does it pass in? I checked the "sender" and the ctx objects and could not find it...

I hardwired the mit-license.txt filename to prove that the download works...