Microsoft KB Archive/933383

= FIX: Error message if you modify a resource file when an ASP.NET 2.0 application is running: &quot;System.InvalidOperationException The resource class for this page was not found&quot; =

Article ID: 933383

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft ASP.NET 2.0
 * Microsoft .NET Framework 2.0

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SYMPTOMS
In a Microsoft ASP.NET 2.0 application, you create a local resource file (.resx) that is associated with a Web page (.aspx) or with a user control (.ascx). If you modify the resource file when the ASP.NET 2.0 application is running, you may receive the following error message:

Exception Details: System.InvalidOperationException: The resource class for this page was not found. Please check if the resource file exists and try again.



CAUSE
This problem occurs because ASP.NET 2.0 does not monitor the changes to the resource file. If you modify the resource file when the ASP.NET 2.0 application is running, the resource file is not recompiled. Therefore, the .aspx file that is already compiled becomes out of synchronization with the resource file. Or, the .ascx file that is already compiled becomes out of synchronization with the resource file. Therefore, an exception occurs.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only 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 2.0 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer 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.

Additionally, this hotfix is included with hotfix 934839. For more information about hotfix 934839, click the following article number to view the article in the Microsoft Knowledge Base:

934839 FIX: You may receive an exception when you browse a .NET Framework 2.0 ASP.NET Web application

To obtain hotfix 934839, visit the following Microsoft Web site:

http://connect.microsoft.com/VisualStudio/content/content.aspx?ContentID=3705

Prerequisites
You must have the .NET Framework 2.0 installed to apply this hotfix.

Restart requirement
You do not have to restart the computer after you apply this hotfix. However, Internet Information Services (IIS) is restarted automatically during the installation of 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.

The .NET Framework 2.0, Itanium-based versions


WORKAROUND
To work around this problem, use one of the following methods.

Method 1
Modify the .aspx file that uses the resource file, or modify the .ascx file that uses the resource file. Then, the .aspx file is recompiled, or the .ascx file is recompiled.

Method 2
Modify the Web.config file of the ASP.NET 2.0 application. Then, the whole ASP.NET 2.0 application is recompiled.



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

Additional query words: resx InvalidOperationException

Keywords: kbfix kbqfe kbpubtypekc kbhotfixserver KB933383

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