When you use the Native Image Generator (Ngen.exe) in managed code on a computer that is running the Microsoft .NET Framework 2.0, a regeneration of the 32nd Ngen image may not trigger a recompilation of the Ngen image. Additionally, an invalid Ngen image may load and run in the process.

Back to the top

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 2.0 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: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

To install this hotfix, you must be running the .NET Framework 2.0.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other software updates.

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.

File name	File version	File size	Date	Time	Platform
Mscordacwks.dll	2.0.50727.87	800,256	14-Mar-2006	11:49	x86
Mscorlib.dll	2.0.50727.87	4,317,184	14-Mar-2006	11:49	x86
Mscorwks.dll	2.0.50727.87	5,617,152	14-Mar-2006	11:49	x86
Sos.dll	2.0.50727.87	377,344	14-Mar-2006	11:49	x86

Back to the top

To work around this problem, reconstruct all Ngen images on the computer whenever an assembly that includes an Ngen image is regenerated. All Ngen images are regenerated when the regeneration process runs the following command:

Back to the top

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

Back to the top

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Back to the top