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I think this is the limitation of the web being slow, two requests are going
to the web server and it goes for a toss. The workaround should be,
javascript, detect if the index is changed with the onClick event and
disable it. This will prevent the user from clicking it again.

Say combo.Attributes.add("disable", --- js for enable=false goes here).

The js mentioned the syntax is not correct, u can get it from net anywhere.

"Rob Gommans" <> wrote in message
news:...
> Hi
>
> We have a problem with a DropDownList control in combination with the IE
> browser. When you select an item from the DropDownList (which has
> AutoPostBack set to True and a onSelectedIndexChanged eventhandler) and
> quickly - before the request has been completely sent - click the
> DropDownList control again, a blank page will appear. Refreshing the frame
> will show the page again, but with the initial viewstate. The first item
in
> the list is selected again. The same behaviour occurs with a ListBox
> control.
>
> Does anybody know a solution for this problem? Enclosed in this post is a
> sample application to reproduce the problem. The appl needs the local SQL
> Server database Northwind.
> Thanks in advance for your time and effort!
>
> Rob Gommans
> Dynafix Applications
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