Web Forms :: Multiple File Uploads And Access The Control Inside An Iframe?

i'm developing a web application using asp.net 3.5 sp1, my issue is , i need to upload multiple files asynchronously.

for that i used the ajax control toolkit "async file upload", where i can only upload single file and cannot track the filenames after uploading, so i go for the "file uploaded ajax"

[URL]

when i started including the cascading dropdown in that page("mainpage.aspx") , an error occured in the page, ie; when i click add files of the "file upload ajax", the "file upload" control some times doesnot show, so i created another page("testpage.aspx") and included the "file upload" control in that page and created an iframe in the "mainpage.aspx" and call the "testpage.aspx", now it is working fine, but i was not able to track the filename, can i access the control inside that iframe from the "mainpage.aspx" ?

mainpage.aspx

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
<form id="form1" runat="server" enctype="multipart/form-data">
<ajaxToolkit:ToolkitScriptManager EnablePartialRendering="true" runat="server" ID="ScriptManager1" />
<div>

[Code]....