Install this update to address a set of known compatibility and reliability issues with Microsoft .NET Framework 3.5.1 Service Pack 1. We recommend that you apply this update if you have ASP.NET Framework-based web applications that are running on your Microsoft Internet Information Services (IIS). After you install this update, you may have to restart your computer.

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Download
This update is available from Windows Update. Or, download this update for the Microsoft .NET Framework 3.5.1 from Microsoft Download Center.Virus-free claim
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Microsoft scanned this file for viruses, using the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to it.
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Issues that this update resolves

Issue 1

Consider the following scenario:
  • You use a browser which can’t be recognized by ASP.NET, such as Amazon Kindle Fire 2 or Internet Explorer 11, to access an ASP.NET-based webpage.
  • You trigger a postback event on that webpage.
In this scenario, the postback operation fails, and you receive the following error message:
"Script Error encountered", "'__doPostBack' is undefined"

Third-party information disclaimer

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The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
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Issue 2

Consider the following scenario:
  • An ASP.NET website renders different content based on the user browser.
  • A user uses Internet Explorer 11 to visit this ASP.NET website.
In this scenario, ASP.NET cannot recognize Internet Explorer 11 and will not render the content correctly. After the user applies this hotfix, Internet Explorer 11 can be recognized as InternetExplorer by ASP.NET.

Issue 3

Consider the following scenario:
  • An ASP.NET page contains an update panel, and inside it there is an ImageButton. If user clicks ImageButton, it will trigger a partial postback event and the server side click event.
  • A user uses Internet Explorer 10 or a later version to access this ASP.NET page, and then clicks the Imagebutton.
In this scenario, the partial postback fails, and the server side click event is not fired.

Issue 4

Consider the following scenario:
  • There is an ASP.NET page that contains a menu control.
  • A user uses Internet Explorer 11 to access that page and, presses Tab to switch the focus between the menu control and other controls.
In this scenario, the user will receive the following JavaScript error message:
Error: SCRIPT5007: Unable to get value of the property 'toLowerCase': object is null or undefined
Note 1 There is a configuration switch to be used to revert back to the old behavior:
<appSettings>
<add key="aspnet:UseLegacyBrowserCaps" value="true" />
</appSettings>

For more information

Additional information for this update

Restart requirement

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Close all .NET Framework-based applications before you apply this update. Additionally, restart the computer after you apply this update if any affected files are being used.
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Update replacement information

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This update package replaces the released hotfix packages in the following Microsoft Knowledge Base article:
2616142 FIX: "SCRIPT438: Object doesn't support property or method 'setProperty'" error message when you visit a .NET Framework 3.5-based ASP.NET webpage in Internet Explorer 10
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Command-line switches for this update

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See the various command-line switches that are supported by this update.
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How to uninstall this update

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To remove this update, use the Add or Remove Programs item or the Programs and Features item in Control Panel.
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File information

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The global 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.

GDR service branch

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For all supported x86-based versions of Windows Server 2008 R2 SP1 and Windows 7 SP1
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File nameFile versionFile sizeDateTime
system.web.extensions.dll3.5.30729.54541,277,95219-Apr-201322:55
system.web.extensions.dll3.5.30729.54541,277,95219-Apr-201322:55
For all supported IA64-based versions of Windows Server 2008 R2 SP1 and Windows 7 SP1
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File nameFile versionFile sizeDateTime
system.web.extensions.dll3.5.30729.54541,277,95219-Apr-201322:53
system.web.extensions.dll3.5.30729.54541,277,95219-Apr-201322:55
system.web.extensions.dll3.5.30729.54541,277,95219-Apr-201322:55
For all supported x64-based versions of Windows Server 2008 R2 SP1 and Windows 7 SP1
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File nameFile versionFile sizeDateTime
system.web.extensions.dll3.5.30729.54541,277,95219-Apr-201322:54
system.web.extensions.dll3.5.30729.54541,277,95219-Apr-201322:55
system.web.extensions.dll3.5.30729.54541,277,95219-Apr-201322:55
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LDR service branch

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For all supported x86-based versions of Windows Server 2008 R2 SP1 and Windows 7 SP1
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File nameFile versionFile sizeDateTime
system.web.extensions.dll3.5.30729.70401,282,04819-Apr-201322:54
system.web.extensions.dll3.5.30729.70401,282,04819-Apr-201322:54
For all supported IA64-based versions of Windows Server 2008 R2 SP1 and Windows 7 SP1
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File nameFile versionFile sizeDateTime
system.web.extensions.dll3.5.30729.70401,282,04819-Apr-201322:52
system.web.extensions.dll3.5.30729.70401,282,04819-Apr-201322:54
system.web.extensions.dll3.5.30729.70401,282,04819-Apr-201322:54
For all supported x64-based versions of Windows Server 2008 R2 SP1 and Windows 7 SP1
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File nameFile versionFile sizeDateTime
system.web.extensions.dll3.5.30729.70401,282,04819-Apr-201322:54
system.web.extensions.dll3.5.30729.70401,282,04819-Apr-201322:54
system.web.extensions.dll3.5.30729.70401,282,04819-Apr-201322:54
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About this article

Article ID: 2836942
Last review: February 6, 2014
Applies to: Windows 7 Service Pack 1 (Microsoft .NET Framework 3.5 Service Pack 1), Windows Server 2008 R2 Service Pack 1 (Microsoft .NET Framework 3.5 Service Pack 1)
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