Microsoft KB Archive/906475

= FIX: Error message when you run a Visual Studio .NET application that tries to load more than one assembly: &quot;System.IO.FileNotFoundException&quot; =

Article ID: 906475

Article Last Modified on 8/23/2006

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APPLIES TO


 * Microsoft .NET Framework 1.0
 * Microsoft Visual Studio .NET 2002 Professional Edition
 * Microsoft Visual Studio .NET 2002 Enterprise Developer
 * Microsoft Visual Studio .NET 2002 Enterprise Architect
 * Microsoft Visual Studio .NET 2002 Academic Edition

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SYMPTOMS
When you run a Microsoft Visual Studio .NET application that tries to load more than one assembly, you may receive an error message that resembles the following:

System.IO.FileNotFoundException. File or assembly name, or one of its dependencies, was not found.

Note In this error message,  is a placeholder for the assembly name that the computer generates at run time.

Additionally, you may receive the following output in the Visual Studio .NET IDE console window:

Object reference not set to an instance of an object.



CAUSE
This problem occurs because the codebase hint in the Machine.config file is not honored when you load more than one assembly. This problem occurs when the first assembly is loaded in the default context, and the second assembly is loaded in the LoadFrom context. This is a bug in the .NET binding infrastructure (fusion).



Hotfix information
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 .NET Framework 1.0 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:

http://support.microsoft.com/contactus/?ws=support

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.

Prerequisites
You must have the .NET Framework 1.0 Service Pack 3 (SP3) 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 hotfix.

Hotfix 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.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
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

Keywords: kbappdev kbdevstudio kbdev kbbug kbfix kbhotfixserver kbqfe KB906475

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