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FIX: You may receive an error message when you try to build a Web project that references a .NET Compact Framework 2.0 assembly in Visual Basic 2005

This article has been archived. It is offered "as is" and will no longer be updated.
When you try to build a Web project in Microsoft Visual Basic 2005, the operation may be unsuccessful. You may also receive the following error message:
Error BC30009: Reference required to assembly 'System.Xml, Version=, Culture=neutral, PublicKeyToken=969db8053d3322ac, Retargetable=Yes' containing the implemented interface 'System.Xml.Serialization.IXmlSerializable'. Add one to your project.
You receive the error message even though the project correctly references the System.XML assembly.

This problem occurs when the following conditions are true:
  • The Web project references a Microsoft .NET Compact Framework 2.0 assembly.
  • The .NET assembly uses a file reference.
This problem occurs because a bug exists in the Visual Basic 2005 compiler.
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.


You must have Microsoft Visual Studio 2005 installed to apply this hotfix.

Restart requirement

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

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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.

This hotfix includes two packages. One package is for Visual Studio 2005, and one package is for the Microsoft .NET Framework 2.0. You must install both packages, especially for Web projects. The two packages are zipped into one file.

The Visual Studio 2005 package is named VS80-KB919904-X86-ENU.exe and includes the following two files:
File nameVersionDateTimeSizeCPU
The .NET Framework 2.0 package is named NDP20-KB920302-X86.exe and includes the following file:
File nameVersionDateTimeSize
Microsoft has confirmed that this is a bug 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: 919904 - Last Review: 01/16/2015 01:59:00 - Revision: 1.1

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

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