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Asked: 2026-05-14T23:25:19+00:00

I have a QuestionControl.ascx and a QuestionControl.ascx.cs code behind file I copied to a

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I have a QuestionControl.ascx and a QuestionControl.ascx.cs code behind file I copied to a new project. When I build the project any references in the code behind file to controls declared in the ascx gives me this error:

‘QuestionControl’ does not contain a
definition for ‘rdbtnlstQuestion1’ and
no extension method
‘rdbtnlstQuestion1’ accepting a first
argument of type ‘QuestionControl’
could be found (are you missing a
using directive or an assembly
reference?)

This is at the top of my *.ascx:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="QuestionControl.ascx.cs" Inherits="QuestionControl" %>

I’ve also tried CodeBehind:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="QuestionControl.ascx.cs" Inherits="QuestionControl" %>

This is the top of my class in the codebehind file, it is not contained in a namespace:

public partial class QuestionControl : System.Web.UI.UserControl
{
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1 Answer

  1. Editorial Team

    Try deleting your designer file. VS.NET should recreate it for you when you open the ascx file. I’ve had problems like this in the past where the designer gets out-of-sync for some reason, and deleting it usually fixes the problem.

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