FIX: Error message when you try to add a user-defined control to a Windows Form by using Visual Studio 2005: "Debug assertion failed"

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Article ID: 916495 - View products that this article applies to.
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When you try to add a user-defined control to a Windows Form in a Microsoft Windows application by using Microsoft Visual Studio 2005, you receive the following error message:
Debug Assertion Failed message at atlwin.h line 2807
Additionally, Visual Studio may stop responding. This problem occurs when the user-defined control contains a Microsoft ActiveX Template Library (ATL) control.

Note This problem does not occur when you use Visual Studio .NET 2003.


This problem occurs because of code in the built-in System.Windows.Forms.ErrorProvider class.


A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio 2005 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.


The following list contains prerequisites for the hotfix:
  • Microsoft Visual Studio 2005

Restart requirement

You do not have to restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

Hotfix file information

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File nameFile versionFile sizeDateTimePlatform,320,70414-Mar-200611:49x86


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates


Article ID: 916495 - Last Review: January 17, 2015 - Revision: 1.0
  • Microsoft Visual Studio 2005 Express Edition
  • Microsoft Visual Studio 2005 Professional Edition
  • Microsoft Visual Studio 2005 Standard Edition
  • Microsoft Visual Studio 2005 Team System Architect Edition
  • Microsoft Visual Studio 2005 Team System Developer Edition
  • Microsoft Visual Studio 2005 Team Foundation
  • Microsoft Visual Studio 2005 Team System Test Edition
kbnosurvey kbarchive kbfix kbqfe kbpubtypekc kbhotfixserver KB916495

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