Download .Net Framework 4.5 for Windows - (2023)

.Net Framework4.5 Download .Net Framework 4.5 for Windows - (1) 0out of5based on0 ratings.

.NET for Windows Store apps

Windows Metro style apps are designed for specific form factors and leverage the power of the Windows operating system. A subset of the .NET Framework 4.5 is available for building Metro style apps for Windows by using C# or Visual Basic. This subset is called .NET for Windows Store apps and is discussed in anoverview in the Windows Dev Center.

Portable Class Libraries

The Portable Class Library project in Visual Studio 2012 enables you to write and build managed assemblies that work on multiple .NET Framework platforms. Using a Portable Class Library project, you choose the platforms (such as Windows Phone and .NET for Windows Store apps) to target. The available types and members in your project are automatically restricted to the common types and members across these platforms.

For more information, see Portable Class Library Overview.

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Core New Features and Improvements

The following features and improvements were added to the common language runtime and to .NET Framework classes:

  • Ability to reduce system restarts by detecting and closing .NET Framework 4 applications during deployment. See Reducing System Restarts During .NET Framework 4.5 Installations.
  • Support for arrays that are larger than 2 gigabytes (GB) on 64-bit platforms. This feature can be enabled in the application configuration file. See the<gcAllowVeryLargeObjects> element, which also lists other restrictions on object size and array size.
  • Better performance through background garbage collection for servers. When you use server garbage collection in the .NET Framework 4.5, background garbage collection is automatically enabled.
  • Background just-in-time (JIT) compilation, which is optionally available on multi-core processors to improve application performance. SeeProfileOptimization.
  • Ability to limit how long the regular expression engine will attempt to resolve a regular expression before it times out. See the RegexMatchTimeoutproperty.
  • Ability to define the default culture for an application domain. See the CultureInfo class.
  • Console support for Unicode (UTF-16) encoding. See the Console class.
  • Support for versioning of cultural string ordering and comparison data. See the SortVersion class.
  • Better performance when retrieving resources. See Packaging and Deploying Resources in Desktop Apps.
  • Zip compression improvements to reduce the size of a compressed file. See the System.IO.Compression namespace.
  • Ability to customize a reflection context to override default reflection behavior through the CustomReflectionContext class.
  • Support for the 2008 version of the Internationalized Domain Names in Applications (IDNA) standard when the IdnMapping class is used on Windows 8.
  • Delegation of string comparison to the operating system, which implements Unicode 6.0, when the .NET Framework is used on Windows 8. When running on other platforms, the .NET Framework includes its own string comparison data, which implements Unicode 5.x. See the String class and the Remarks section of the SortVersion class.
  • Ability to compute the hash codes for strings on a per application domain basis. See <UseRandomizedStringHashAlgorithm> Element.

Managed Extensibility Framework (MEF)

The Managed Extensibility Framework (MEF) provides the following new features:

  • Support for generic types.
  • Convention-based programming model that enables you to create parts based on naming conventions rather than attributes.
  • Multiple scopes.
  • A subset of MEF that you can use when you create Metro style apps. This subset is available as a downloadable package from the NuGet Gallery. To install the package, open your project in Visual Studio 2012, choose Manage NuGet Packages from the Project menu, and search online for theMicrosoft.Composition package.

For more information, see Managed Extensibility Framework Overview.

Asynchronous File Operations

In the .NET Framework 4.5, new asynchronous features were added to the C# and Visual Basic languages. These features add a task-based model for performing asynchronous operations. To use this new model, use the asynchronous methods in the I/O classes. See Asynchronous File I/O.

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Resource File Generator (Resgen.exe) enables you to create a .resw file for use in Windows Metro style apps from a .resources file embedded in a .NET Framework assembly. For more information, see Resgen.exe (Resource File Generator).

Parallel Computing

The .NET Framework 4.5 provides several new features and improvements for parallel computing. These include improved performance, increased control, improved support for asynchronous programming, a new dataflow library, and improved support for parallel debugging and performance analysis. See the entry What’s New for Parallelism in .NET 4.5 in the Parallel Programming with .NET blog.


ASP.NET 4.5 includes the following new features:

  • Support for new HTML5 form types.
  • Support for model binders in Web Forms. These let you bind data controls directly to data-access methods, and automatically convert user input to and from .NET Framework data types.
  • Support for unobtrusive JavaScript in client-side validation scripts.
  • Improved handling of client script through bundling and minification for improved page performance.
  • Integrated encoding routines from the AntiXSS library (previously an external library) to protect from cross-site scripting attacks.
  • Support for WebSockets protocol.
  • Support for reading and writing HTTP requests and responses asynchronously.
  • Support for asynchronous modules and handlers.
  • Support for content distribution network (CDN) fallback in the ScriptManager control.

For more information about these features, see ASP.NET 4.5 and Visual Studio 2012.

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The .NET Framework 4.5 provides a new programming interface for HTTP applications. For more information, see the new System.Net.Http andSystem.Net.Http.Headers namespaces.

Support is also included for a new programming interface for accepting and interacting with a WebSocket connection by using the existing HttpListener and related classes. For more information, see the new System.Net.WebSockets namespace and the HttpListener class.

In addition, the .NET Framework 4.5 includes the following networking improvements:

  • RFC-compliant URI support. For more information, see Uri and related classes.
  • Support for Internationalized Domain Name (IDN) parsing. For more information, see Uri and related classes.
  • Support for Email Address Internationalization (EAI). For more information, see the System.Net.Mail namespace.
  • Improved IPv6 support. For more information, see the System.Net.NetworkInformation namespace.
  • Dual-mode socket support. For more information, see the Socket and TcpListener classes.

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Windows Presentation Foundation (WPF)

In the .NET Framework 4.5, Windows Presentation Foundation (WPF) contains changes and improvements in the following areas:

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  • The new Ribbon control, which enables you to implement a ribbon user interface that hosts a Quick Access Toolbar, Application Menu, and tabs.
  • The new INotifyDataErrorInfo interface, which supports synchronous and asynchronous data validation.
  • New features for the VirtualizingPanel and Dispatcher classes.
  • Improved performance when displaying large sets of grouped data, and by accessing collections on non-UI threads.
  • Data binding to static properties, data binding to custom types that implement the ICustomTypeProvider interface, and retrieval of data binding information from a binding expression.
  • Repositioning of data as the values change (live shaping).
  • Ability to check whether the data context for an item container is disconnected.
  • Ability to set the amount of time that should elapse between property changes and data source updates.
  • Improved support for implementing weak event patterns. Also, events can now accept markup extensions.

For more information, see What's New in WPF Version 4.5 RC.

Windows Communication Foundation (WCF)

In the .NET Framework 4.5, the following features have been added to make it simpler to write and maintain Windows Communication Foundation (WCF) applications:

  • Simplification of generated configuration files.
  • Support for contract-first development.
  • Ability to configure ASP.NET compatibility mode more easily.
  • Changes in default transport property values to reduce the likelihood that you will have to set them.
  • Updates to the XmlDictionaryReaderQuotas class to reduce the likelihood that you will have to manually configure quotas for XML dictionary readers.
  • Validation of WCF configuration files by Visual Studio as part of the build process, so you can detect configuration errors before you run your application.
  • New asynchronous streaming support.
  • New HTTPS protocol mapping to make it easier to expose an endpoint over HTTPS with Internet Information Services (IIS).
  • Ability to generate metadata in a single WSDL document by appending ?singleWSDL to the service URL.
  • Websockets support to enable true bidirectional communication over ports 80 and 443 with performance characteristics similar to the TCP transport.
  • Support for configuring services in code.
  • XML Editor tooltips.
  • ChannelFactory caching support.
  • Binary encoder compression support.
  • Support for a UDP transport that enables developers to write services that use "fire and forget" messaging. A client sends a message to a service and expects no response from the service.
  • Ability to support multiple authentication modes on a single WCF endpoint when using the HTTP transport and transport security.
  • Support for WCF services that use internationalized domain names (IDNs).

For more information, see What's New in Windows Communication Foundation.

Windows Workflow Foundation (WF)

Several new features have been added to Windows Workflow Foundation (WF) in the .NET Framework 4.5. These new features include:

  • State machine workflows, which were first introduced as part of the .NET Framework 4.0.1 (.NET Framework 4 Platform Update 1). This update included several new classes and activities that enabled developers to create state machine workflows. These classes and activities were updated for the .NET Framework 4.5 to include:
    • The ability to set breakpoints on states.
    • The ability to copy and paste transitions in the workflow designer.
    • Designer support for shared trigger transition creation.
    • Activities for creating state machine workflows, including: StateMachine, State, and Transition.
  • Enhanced Workflow Designer features such as the following:
    • Enhanced workflow search capabilities in Visual Studio, including Quick Find and Find in Files.
    • Ability to automatically create a Sequence activity when a second child activity is added to a container activity, and to include both activities in the Sequence activity.
    • Panning support, which enables the visible portion of a workflow to be changed without using the scroll bars.
    • A new Document Outline view that shows the components of a workflow in a tree-style outline view and lets you select a component in theDocument Outline view.
    • Ability to add annotations to activities.
    • Ability to define and consume activity delegates by using the workflow designer.
    • Auto-connect and auto-insert for activities and transitions in state machine and flowchart workflows.
  • Storage of the view state information for a workflow in a single element in the XAML file, so you can easily locate and edit the view state information.
  • A NoPersistScope container activity to prevent child activities from persisting.
  • Support for C# expressions:
    • Workflow projects that use Visual Basic will use Visual Basic expressions, and C# workflow projects will use C# expressions.
    • C# workflow projects that were created in Visual Studio 2010 and that have Visual Basic expressions are compatible with C# workflow projects that use C# expressions.
  • Versioning enhancements:
    • The new WorkflowIdentity class, which provides a mapping between a persisted workflow instance and its workflow definition.
    • Side-by-side execution of multiple workflow versions in the same host, including WorkflowServiceHost.
    • In Dynamic Update, the ability to modify the definition of a persisted workflow instance.
  • Contract-first workflow service development, which provides support for automatically generating activities to match an existing service contract.


How to install .NET Framework 4.5 on Windows 10? ›

In newer windows, such as Windows 10, 8.1 and 8, . Net framework 4.5 is available as part of the OS, and is installed by default. For Windows 7 and Vista, you need to download the . NET framework 4.5 redistributable from Microsoft website and install it manually. .

Can I install NET Framework 4.5 on Windows 7? ›

1 Language Pack (Offline Installer) is available for Windows Vista, Windows 7, Windows 8, Windows Server 2008, Windows Server 2008 R2 and Windows Server 2012.

Is .NET framework 4.5 free? ›

Download .NET Framework 4.5. Free official downloads. Created with Sketch.

How do I install .NET Framework 4.5 on Windows 7 offline? ›

NET Framework 4.5 download link and click Download to download the setup file. The download process requires internet connection. However, the download PC can be a different PC from the Server PC. The installation process does not require internet connection once the installer file is downloaded.

How to install .NET 4 framework in Windows 10? ›

NET Framework is enabled on Windows Features.
  1. Click the Start button.
  2. Type Windows Features.
  3. Select Turn Windows feature on or off.
  4. If prompted, click Yes or enter the administrator password.
  5. Confirm if the check box for . ...
  6. If its both items are enabled, clear the check box, and then click OK.
  7. Restart your PC.
Dec 30, 2017

How to install NET Framework 4.5 manually? ›

in the Command Prompt window to start Windows PowerShell. and press Enter to install the NET Framework 4.5 Features feature. Additional Information: The following NET Framework 4.5 Features role services can be installed using Windows PowerShell.

Which version of NET Framework is compatible with Windows 7? ›

Supported Platforms

NET Framework 4.7. 1 is supported on the following operating systems: Windows 7 Service Pack 1 (x86 and x64) Windows 8.1 (x86 and x64)

Which version of NET framework is best for Windows 7? ›

I have been using and enjoying Microsoft Net Framework 4.5. x for Windows 7 and find it to be the most stable on Windows 7 and Windows 8.

How do I fix net framework 4.5 installed not successful? ›

To fix the error, you download Full Verison of Required Framework and Install (Offline Installer). To download Framework 4.5. 2 Click Here (You download as required).

Is .NET Framework 4.5 still supported? ›

Support for . NET Framework versions 4.5. 2, 4.6, and 4.6. 1 ended on April 26, 2022, so security fixes, updates, and technical support for these versions will no longer be provided.

Does installing Net Framework 4.5 require a reboot? ›

NET Framework 4.5 installation requires a system restart if a . NET Framework 4 app is in use during the installation.

How do I manually install .NET framework on Windows 7? ›

1 on Windows 7:
  1. Select Start > Control Panel > Programs > Programs and Features.
  2. Select Turn Windows features on or off.
  3. If not already installed, select Microsoft . NET Framework 3.5. 1 and click OK.
  4. Restart the machine when prompted.

How can I Download NET Framework manually? ›

This option requires an Internet connection.
  1. Press the Windows key. on your keyboard, type "Windows Features", and press Enter. ...
  2. Select the .NET Framework 3.5 (includes .NET 2.0 and 3.0) check box, select OK, and reboot your computer if prompted.
Jul 23, 2022

How do I reinstall .NET Framework on Windows 7? ›

Open the Windows Start menu. Type "Control Panel" into the search and open Control Panel. Go to Programs and Features. Select Uninstall a Program.
Check NET Framework 3.5 SP1
  1. Select the checkbox to turn on . NET Framework 3.5 SP1.
  2. Select OK to save your changes.
  3. Restart your computer.

How do I enable .NET Framework 4.5 on Windows? ›

Select Start > Control Panel > Programs > Programs and Features. Select Turn Windows features on or off. If not already installed, select Microsoft . NET Framework and click OK.

What version of .NET Framework comes with Windows 10 2004? ›

NET Framework 3.5 and 4.8 for Windows 10 Version 2004.

Does Windows 10 come with .NET 4? ›

. NET Framework 4.8 is included with: Windows 10 May 2021 Update.

How do I manually install .NET framework on Windows 10? ›

This option requires an Internet connection.
  1. Press the Windows key. on your keyboard, type "Windows Features", and press Enter. ...
  2. Select the .NET Framework 3.5 (includes .NET 2.0 and 3.0) check box, select OK, and reboot your computer if prompted.
Jul 23, 2022

Can I install .NET framework on Windows 10? ›

The . NET Framework 4.6. 2 is the latest supported . NET Framework version on Windows 10 1507 and 1511.

What do I do if .NET Framework is not installed? ›

Here we show you how to solve this issue. First, you can check if the component is already installed on your device. Go to Control Panel > Programs > Turn Windows features on or off, verify if . NET Framework 3.5 checkbox is selected and then proceed with the software installation.

What happens if the .NET Framework is not installed? ›

If the . NET Framework version a program needs is not installed, you'll get an error message like the one shown below. The application error message will usually detail the version that's required. The .

How do I force reinstall NET Framework? ›

Open the Windows Start menu. Type "Control Panel" into the search and open Control Panel. Go to Programs and Features. Select Uninstall a Program.
Check NET Framework 3.5 SP1
  1. Select the checkbox to turn on . NET Framework 3.5 SP1.
  2. Select OK to save your changes.
  3. Restart your computer.

Can I install .NET 4.5 Windows 10? ›

NET 4.5. 1 cannot be installed on Windows 10, only 4.6 and later. So if your application is incompatible with . NET 4.6 and later you will need to update your application.

Why is NET Framework not installing on Windows 10? ›

You must be an administrator on the computer to install the . NET Framework. Setup cannot continue because a previous installation requires your computer to be restarted. Please restart your computer and rerun Setup.

How do I enable .NET Framework 4.5 on windows? ›

Select Start > Control Panel > Programs > Programs and Features. Select Turn Windows features on or off. If not already installed, select Microsoft . NET Framework and click OK.

Why can't I update my .NET Framework? ›

Symptoms. This issue occurs because, when the Microsoft . NET Framework 4 is installed, certain components are locked or are being used until the system is restarted. These components cannot be updated until the system is restarted.

Is .NET framework 4.5 installed? ›

The version of .NET Framework (4.5 and later) installed on a machine is listed in the registry at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full. If the Full subkey is missing, then .NET Framework 4.5 or above isn't installed.

Do I need to install all .NET Framework versions? ›

You need to install the . NET Framework to run many apps on Windows. The best versions to install are the latest one and the . NET Framework 3.5 SP1.

How do I enable .NET Framework 4.8 in Windows 7? ›

Microsoft . NET Framework 4.8
  1. Download the Microsoft . ...
  2. On the installation screen, after reading and agreeing to the terms of use subscription, check the option I have read and accept the terms of the agreement. ...
  3. Wait while the Microsoft . ...
  4. After the installation is complete click Finish and restart the computer.
Apr 25, 2022

Do I need all .NET framework versions? ›

NET Framework that it was built for. If that version is not present and the application configuration file does not define supported versions, a . NET Framework initialization error may occur. In this case, the attempt to run the application will fail.


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