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FIX: A memory leak occurs and performance decreases when you run a .NET Framework 3.5 SP1-based application that uses System.AddIn namespaces

SYMPTOMS
You have a Microsoft .NET Framework 3.5 Service Pack 1 (SP1)-based application that is created in Visual C#. The application uses types in System.AddIn namespaces to add some add-ins. When you run the application, a memory leak occurs. Additionally, the performance of the application may decrease if the application runs for a long time. 
CAUSE
This issue occurs because some System.AddIn.Hosting.AddInActivator+ResolverHelper and System.ResolveEventHandler objects stay in memory after garbage collection is completed. 
RESOLUTION

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 software update 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: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 apply this hotfix, you must have the .NET Framework 3.5 SP1 installed.

Restart requirement

Before you apply this hotfix, it is recommended that you exit all instances of Visual Studio and all .NET Framework-based applications. You do not have to restart the computer after you apply the hotfix if the affected files are not being used.

Hotfix replacement information

This hotfix does not replace any other 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 information for all supported x86-based versions of Windows XP, of Windows Server 2003, of Windows Vista, and of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
System.addin.dll3.5.30729.5092163,84020-Jan-201104:14x86
File information for all supported x64-based versions of Windows XP, of Windows Server 2003, of Windows Vista, and of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
System.addin.dll3.5.30729.5092163,84020-Jan-201104:14x86
File information for all supported IA-64-based versions of Windows XP, of Windows Server 2003, of Windows Vista, and of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
System.addin.dll3.5.30729.5092163,84020-Jan-201104:14x86



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

Article ID: 2492755 - Last Review: 03/01/2011 08:55:00 - Revision: 1.0

Microsoft .NET Framework 3.5 Service Pack 1

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