I'm having nothing but fits so far with this chapter. I try making the UPdatePanel page and there is no "unclickable gray area." When I enter the code in the first TryItOut and try to run, I get a message

Severity Code Description Project File Line Suppression State
Error 'Demos_$safeitename$' is not a valid value for attribute 'inherits'. D:\ASP.NET Websites\BegASPNET\Site\Demos\UpdatePanel.aspx 1

And it tells me that "Label1" is not declared...
Severity Code Description Project File Line Suppression State
Error BC30451 'Label1' is not declared. It may be inaccessible due to its protection level. Site D:\ASP.NET Websites\BegASPNET\Site\Demos\UpdatePanel.aspx.vb 6 Active

I finally gave up and copied-and-pasted the code from the Source folder and I'm still getting those errors. It's like nothing is working the way the book says it's supposed to. It probably will if I just copy the whole files over, but what's the use in that??

So then I give up and just copy the files from the source folder and when I request UpdatePanel.aspx I get

Server Error in '/' Application.
The control with ID '' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: The control with ID '' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[InvalidOperationException: The control with ID '' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.]
System.Web.UI.UpdatePanel.get_ScriptManager() +190
System.Web.UI.UpdatePanel.RegisterPanel() +89
System.Web.UI.UpdatePanel.OnInit(EventArgs e) +20
System.Web.UI.Control.InitRecursive(Control namingContainer) +139
System.Web.UI.Control.InitRecursive(Control namingContainer) +312
System.Web.UI.Control.InitRecursive(Control namingContainer) +312
System.Web.UI.Control.InitRecursive(Control namingContainer) +312
System.Web.UI.Control.InitRecursive(Control namingContainer) +312
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +408

Hi there,

Take a look at this:

That seems to suggest you have an issue with your new page you created from the Add New dialog. Looks like something got messed up earlier in the book.

Chapter 6, page 212, section "Creating Reusable Page Templates" shows you how to create your own templates using the $safeitename$ placeholders. Maybe stuff got messed up there? You could redo the exercise to make sure you have the right template as a starting point. You can also use the ZIP files supplied with the book (under Csharp\Resources\Chapter 06) but those will only work when you followed the book exactly. so you're probably better off building your own templates.

Hope this helps and let me know if it doesn't.

Imar

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Imar Spaanjaars
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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