User-1136466523 posted
Hi,
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I guess what you are talking about is the custom server control instead of the user control (.ascx), right? Since how can user control be added into GAC? If so,
a Web page that contains a custom ActiveX control may not load as expected in Internet Explorer due to defense in depth changes introduced in cumulative security update 896688 (MS05-052).
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For details and workaround, see:
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http://support.microsoft.com/kb/909738/en-us
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Thanks.