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BOOK: Beginning ASP.NET 4 : in C# and VB
This is the forum to discuss the Wrox book Beginning ASP.NET 4: in C# and VB by Imar Spaanjaars; ISBN: 9780470502211
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Old April 12th, 2011, 10:40 AM
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Default Update Panel - Page 523

Hello,
I try to use the same exercise with my new project and I add an « UpdatePanel”, but when I execute the program, I have this error (The message probably is not exactly, but I translate in English from Italian):

The control with ID 'UpdatePanel1' requires a ScriptManager on the page. The ScriptManager must be specified before the controls that need it.

I add the control ScriptManager empty before the UpdatePanel1 and after I have my photo album…

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>


Why? I don’t understand. I think all code is the same of book exercise.
Thanks.
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Old April 12th, 2011, 10:51 AM
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Hi there,

Did adding the ScriptManager fix the problem and do you know why you need to add it? Or did adding it not resolve the problem?

Imar
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Old April 12th, 2011, 10:56 AM
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Yes, the ScriptManager fix the problem. I searched on Internet the error message and I find this solution.

Before, I opened in another window your site (Cap 15) and, I think, I have the same instructions in my site, but the Chap 15 run and my site no!
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Old April 12th, 2011, 11:15 AM
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Quote:
Before, I opened in another window your site (Cap 15) and, I think, I have the same instructions in my site, but the Chap 15 run and my site no
Sorry, but I have no idea what this means.

As the error message suggests, an UpdatePanel needs a ScriptManager (to handle stuff like references to client side script). This works for the examples in the book because the Master Page (Frontend.master) contains a ScriptManager.

Does that help?

Imar
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Old April 12th, 2011, 11:18 AM
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Yes, Perfect!

Thanks.
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