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UpdatePanel IE Hangs with Large Listbox

Posted By:      Posted Date: October 13, 2010    Points: 0   Category :ASP.Net

I think there is a problem with either Internet Explorer (7.0.5730.13) or the AJAX Extension's UpdatePanel. 

Here is my scenario.  I have a Web page (Framework 2.0) with ASP.NET 2.0 AJAX Extensions (1.0.61025.0) installed. On this page I have an update panel and two list boxes (LB1 and LB2).  LB1 is populated with 5000 or more items on page load.  LB1 has auto post back set to true with a server side event to populate LB2 with data based upon the selected item in LB1.  If you have say 10,000 or more items in LB1 then IE appears to hang and reports Not Responding when click on IE.

This works great with Firefox 3 but with IE 7 it takes a very long time to update.  Firefox 3 takes about 1 second to update LB2 whereas IE7 takes about 15-16 seconds to populate LB2.  If I remove the update panel then IE will populate LB2 almost as fast as Firefox.

Can anyone else duplicate this?  Does any have any idea if this is a problem with Microsoft's AJAX Extensions?  Is this a problem with IE?

Here is my front end page code:

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <form id="form1" ru

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