Description of a hotfix package that fixes various issues in WCF Data Services for the Microsoft .NET Framework 4 in Windows XP, in Windows Server 2003, in Windows Vista, in Windows Server 2008, in Windows 7, or in Windows Server 2008 R2

A hotfix package is available for WCF Data Services (previously known as ADO.NET Data Services) for the Microsoft .NET Framework 4. This hotfix is designed for the .NET Framework 4 on a computer that is running one of the following operating systems:

• Windows XP
• Windows Server 2003
• Windows Vista
• Windows Server 2008
• Windows 7
• Windows Server 2008 R2

Issues that are fixed by this hotfix package

Issue 1

MethodAccessException exceptions may occur on a medium trust server that uses Feed Customization (Friendly Feed) mappings.

Issue 2

WCF Data Services that use the POCO Entity Generator template in ADO.NET C# do not work correctly if you enable proxy generation. Additionally, you may receive an error message that resembles the following:

Issue 3

An update operation may succeed unexpectedly when the entity tag (Etag) in an update request does not match the Etag on the server. In this case, data corruption may occur. This issue occurs when you use the PUT method, the MERGE method, or the DELETE method for the update operation. The expected behavior is that the update operation fails and you receive status code 412 "Precondition failed."

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 website: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

You must have the .NET Framework 4 installed one of the following Windows operating systems to apply this update:

• Windows XP
• Windows Server 2003
• Windows Vista
• Windows Server 2008
• Windows 7
• Windows Server 2008 R2

Restart requirement

You do not have to restart the computer after you apply this hotfix package if no instance of the .NET Framework is being used.

Hotfix replacement information

This hotfix package 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.

For all supported x86-based versions of the .NET Framework 4

For all supported x64-based versions of the .NET Framework 4

For all supported IA-64-based versions of the .NET Framework 4

For more information about WCF Data Services, visit the following Microsoft websites:
For more information about the partial trust feature compatibility of WCF, visit the following Microsoft websites:For more information about the requirements for creating POCO proxies, visit the following Microsoft websites:For more information about how to download the Microsoft .NET Framework 4, visit the following Microsoft websites: