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Installing the .NET Framework 3.5 on Windows 8

.NET Framework 4.5




The .NET Framework 4.5 is included with Windows 8 and installed on your computer with the operating system. However, the .NET Framework 3.5 is not automatically installed with Windows 8. To run applications that require the .NET Framework 3.5 on Windows 8, you must enable version 3.5 on your computer. There are two ways you can do this: by installing or running an application that requires the .NET Framework 3.5 (that is, by installing the .NET Framework 3.5 on demand), or by enabling the .NET Framework 3.5 in Control Panel. Both options require an Internet connection.
Important notes:

• Use the .NET Framework 3.5 for applications built for versions 2.0 and 3.0 as well as 3.5.
• Installing a Windows language pack on Windows 8 before installing the .NET Framework 3.5 will cause the .NET Framework 3.5 installation to fail. Install the .NET Framework 3.5 before installing any Windows language packs.
• Windows CardSpace is not available with the .NET Framework 3.5 on Windows 8.

Installing the .NET Framework 3.5 on Demand


If an application requires the .NET Framework 3.5, but doesn't find that version enabled on your computer, it displays the following message box, either during installation, or when you run the application for the first time. In the message box, choose Install this feature to enable the .NET Framework 3.5. This option requires an Internet connection.
Prompt for installing the .NET Framework 3.5 on demand



Enabling the .NET Framework 3.5 in Control Panel


You can also enable the .NET Framework 3.5 yourself through Control Panel. In Control Panel, choose Programs and Features, choose Turn Windows features on or off, and then select the Microsoft .NET Framework 3.5.1 check box. This option requires an Internet connection.
Turning Windows features on or off in Control Panel



Troubleshooting


If installing the .NET Framework 3.5 on demand or enabling it in Control Panel fails, you may get one of the following error messages:

• 0x800f0906: “Windows couldn't connect to the Internet to download necessary files. Make sure that you're connected to the Internet, and click Retry to try again.”
• 0x800F081F: “The changes could not be completed. Please reboot your computer and try again.”

These messages may be displayed for the following reasons:

• Your computer is not connected to the Internet. Please connect, and then retry the operation.
  If you cannot connect to the Internet, you can enable the .NET Framework 3.5 by using the Deployment Image Servicing and Management (DISM) command-line tool and specifying the installation media (ISO image or DVD) you installed Windows 8 from.
  
  1. In Windows 8 or Windows Server 2012, open a Command Prompt window with administrative credentials (that is, choose Run as administrator).
  2. To install the .NET Framework 3.5 from installation media located in the D:\sources\sxs directory, use the following command:
     DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:\sources\sxs
     where:
     
     • /Online targets the operating system you're running (instead of an offline Windows image).
     • /Enable-Feature /FeatureName:NetFx3 specifies that you want to enable the .NET Framework 3.5.
     • /All enables all parent features of the .NET Framework 3.5.
     • /LimitAccess prevents DISM from contacting Windows Update.
     • /Source specifies the location of the files needed to restore the feature (in this example, the D:\sources\sxs directory).
     For more information about DISM parameters and options, see How to Enable or Disable Windows Features
     
• You are using a local source, but the network location is inaccessible or doesn’t have the right content. Install the .NET Framework 3.5 from installation media as described in the previous bullet point.
• Your administrator has configured your computer to use Windows Server Update Services (WSUS) instead of Windows Update for servicing. Ask your administrator to enable the policy to use Windows Update instead of WSUS.

If these instructions do not correct the problem, download the paper Microsoft .NET Framework 3.5 Deployment Considerations from the Windows Dev Center for more extensive troubleshooting information.

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.NET Framework 3.5

.NET Framework 3.5







Welcome to the Microsoft .NET Framework version 3.5. The .NET Framework is a technology that supports building and running the next generation of applications and Web services. The .NET Framework consists of the common language runtime (CLR) and the .NET Framework class library, which includes ADO.NET, ASP.NET, Windows Forms, and Windows Presentation Foundation (WPF). The .NET Framework provides a managed execution environment, simplified development and deployment, and integration with a wide variety of programming languages.
You can download the .NET Framework 3.5 from the Microsoft Download Center. (To use the .NET Framework 3.5 on Windows 8, you must enable it on your computer. For instructions, see Installing the .NET Framework 3.5 on Windows 8.)
For a brief introduction to the architecture of the .NET Framework, see .NET Framework Conceptual Overview. For a discussion of .NET Framework version 3.5 and its relationship to previous versions of the .NET Framework, see .NET Framework 3.5 Architecture.
The documentation for the .NET Framework includes an extensive class library reference, conceptual overviews, step-by-step procedures, and information about samples, compilers, and command-line tools. To locate the information that interests you, see the following list of main topic areas.

In This Section


.NET Framework Class LibrarySupplies syntax, code examples, and related information for each class contained in the .NET Framework namespaces.
Quick Technology FinderProvides a table of links to the main technology areas of the .NET Framework.
What's New in the .NET FrameworkDescribes key features that have been added or modified in the latest versions of the .NET Framework.
Overview of the .NET FrameworkDescribes key .NET Framework concepts such as the common language runtime, the common type system (CTS), cross-language interoperability, managed execution, assemblies, and security.
Core Development TechnologiesExplains common programming tasks that apply to a range of .NET Framework applications. Includes topics such as accessing data, file and stream I/O, configuration, encoding, deployment, and debugging.
Advanced Development TechnologiesProvides information about sophisticated development tasks and techniques in the .NET Framework.
Security in the .NET FrameworkProvides information about the classes and services in the .NET Framework that facilitate secure application development.
ASP.NET PortalProvides links to documentation about ASP.NET applications, Web Forms, and Web services.
Windows Forms PortalProvides links to documentation about common programming tasks in Windows Forms applications.
.NET Compact FrameworkIntroduces the .NET Framework-based, hardware-independent environment for running applications on resource-constrained computing devices.
Windows Presentation FoundationProvides information about developing applications using Windows Presentation Foundation (WPF).
Windows Communication Foundation for ApplicationsProvides information on the Windows Communication Foundation (WCF) programming model for building service-oriented applications.
Windows CardSpaceProvides information about CardSpace, which is Microsoft's implementation of an identity metasystem.
Windows Workflow FoundationProvides information on the framework, programming model, and tools for Windows Workflow Foundation (WF).
General Reference for the .NET FrameworkProvides reference information related to the .NET Framework. Includes sections on languages and compilers, tools, technical references, and a glossary of terms.
Tools (.NET Framework)Provides information about tools that make it easier for you to create, deploy, and manage applications and components that target the .NET Framework.
Samples (.NET Framework Technologies)Provides samples that illustrate various aspects of the .NET Framework.

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