FIX: An assembly that uses the System.Data.SqlXml namespace may be dynamically rebased and reloaded after you use the Native Image Generator (Ngen.exe) tool in the .NET Framework 2.0

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Consider the following scenario:
  • You create a managed assembly in the Microsoft .NET Framework 2.0.
  • The assembly uses the System.Data.SqlXml namespace.
  • You create a native image from the managed assembly by using the Native Image Generator (Ngen.exe) tool.
In this scenario, when you run the assembly, the assembly may be dynamically rebased to a different address and reloaded. Therefore, you may experience slow performance.
This problem occurs because the System.Data.SqlXml namespace contains an incorrect public key token in the .NET binding infrastructure (fusion) unification table. The public key token is changed to the ECMA public key token. However, the System.Data.SqlXml namespace still uses the Microsoft public key token.

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 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.


You must have the .NET Framework 2.0 installed before you 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.
File nameFile versionFile sizeDateTime
To work around this problem, do not create a native image from a managed assembly that uses the System.Data.SqlXml namespace.
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
For more information about the Native Image Generator tool, visit the following Microsoft Developer Network (MSDN) Web site:

Article ID: 912365 - Last Review: 01/17/2015 12:48:50 - Revision: 2.0

Microsoft .NET Framework 2.0

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