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

The hotfix for the .NET Framework 3.5 SP1 memory leak involving System.AddIn namespaces is not provided as a direct public download link. To obtain it, contact Microsoft Customer Support Services and request the hotfix described in the article “FIX: A memory leak occurs and performance decreases when you run a .NET Framework 3.5 SP1-based application that uses System.AddIn namespaces.”

Key points from the article:

• The hotfix is intended only for systems that experience this specific memory leak.
• Prerequisite: .NET Framework 3.5 SP1 must be installed.
• Before applying the hotfix, close all instances of Visual Studio and all .NET Framework-based applications.
• A restart is not required if the affected files are not in use.
• The hotfix updates System.addin.dll to version 3.5.30729.5092.
• To request the hotfix, use Microsoft Customer Support Services at: http://support.microsoft.com/contactus/?ws=support

References:

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