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BOOK: ASP.NET 2.0 Website Programming Problem Design Solution ISBN: 978-0-7645-8464-0
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Old September 19th, 2007, 08:23 AM
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Do does anyone know why I get this error
When I insert an UpdatePanel into the TBH masterpage.aspx.

Element 'UpdatePanel' is not a known element. This can occur if there is a compilation error in the Web site.

I do have the ajaxcontroltoolkit.dll in my Bin folder.

Old September 19th, 2007, 10:58 AM
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I was getting same error occasionally (on various pages, not just master page), but closing page (aspx & code behind) and reopening fixed the problem. I may have even needed to restart VS one time.

Good luck,

Old September 20th, 2007, 12:34 AM
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The main AJAX Extensions DLL has to be in the GAC. Did you correctly install it?

If you did then maybe it's a web.config issue. AJAX has some complicated stuff in web.config that is easy to mess up.


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