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FIX: A form that contains lots of controls or member variables takes a long time to load and you receive an error message when you try to open the form in Design view in Visual Studio .NET 2003

This article has been archived. It is offered "as is" and will no longer be updated.

When you try to open a form in Design view in Microsoft Visual Studio .NET 2003, the form takes a long time to load, and you receive the following error message:
'An error occurred while loading the document. Fix the error, and then try loading the document again. The error message follows:Item has already been added. Key in dictionary: "{Form1}" Key being added: "{Form1}'.
This problem occurs when the form contains lots of controls or member variables.
To work around this problem, reduce the number of member variables in the form. To do this, try to encapsulate the member variables into an inner code structure.
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 Microsoft Visual Studio .NET 2003 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 following list contains prerequisites for the hotfix:
  • Microsoft Visual Studio .NET 2003

Restart requirement

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

Hotfix replacement information

This hotfix replaces the hotfix that is described in Microsoft Knowledge Base article 901374.

File information

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.
File nameFile versionFile sizeDateTimePlatform
Ddpatch.hotfixexefile1.0.0.153,24817-Jun-200514:45Not Applicable
Ddpatch.updategacfile1.1.4318.081,92018-May-200517:07Not Applicable
Ddpatch.updateutilfile1.0.3705.3147,45617-Jun-200514:45Not Applicable
M907989.unpatchfileNot Applicable1,183,23210-Oct-200516:39Not Applicable
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: 907989 - Last Review: 01/17/2015 11:59:30 - Revision: 2.0

Microsoft Visual Studio .NET 2003 Professional Edition, Microsoft Visual Studio .NET 2003 Enterprise Architect, Microsoft Visual Studio .NET 2003 Enterprise Developer, Microsoft Visual Studio .NET 2003 Academic Edition

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