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Editorial Team
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Asked: 2026-05-14T03:30:14+00:00

When I generate code using T4 templates in Visual Studio 2010, I get the

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When I generate code using T4 templates in Visual Studio 2010, I get the following error for each of my asp controls when I try to compile:

Control “ddState” is missing required attribute “showat”.

I have never gotten this error in previous versions of .NET. Further, I don’t get this error when I manually construct my pages either by dragging/dropping, nor do I get it when I type out the control text myself. When I generate code, I have to manually add showat="client" to my tag for the compiler to be happy. It was my understanding that I never had to explicitly specify this tag. The following:

<asp:dropdownlist id="ddState" runat="server" showat="client" />

solves the problem. Why do I have to add this to generated code but not other times?

(It’s a VS-2010 webforms project, using VB, in case that makes a difference.)

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1 Answer

  1. Editorial Team

    Check to see if VB does anything in the web form designer page when you use the IDE to add the control. I’m not sure how VB inserts the implicit tag. But that would be something the T4 template would miss, just a thought…

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