.NET Framework version history
Microsoft started development on the .NET Framework in the late 1990s originally under the name of Next Generation Windows Services (NGWS). By late 2001 the first beta versions of .NET 1.0 were released. The first version of .NET Framework was released on 13 February 2002, bringing managed code to Windows NT 4.0, 98, 2000, ME and XP.
Since the first version, Microsoft has released nine more upgrades for .NET Framework, seven of which have been released along with a new version of Visual Studio. Two of these upgrades, .NET Framework 2.0 and 4.0, have upgraded Common Language Runtime (CLR). New versions of .NET Framework replace older versions when the CLR version is the same.
The .NET Framework family also includes two versions for mobile or Embedded device use. A reduced version of the framework, the .NET Compact Framework, is available on Windows CE platforms, including Windows Mobile devices such as smartphones. Additionally, the .NET Micro Framework is targeted at severely resource-constrained devices.
- 1 Overview
- 2 .NET Framework 1.0
- 3 .NET Framework 1.1
- 4 .NET Framework 2.0
- 5 .NET Framework 3.0
- 6 .NET Framework 3.5
- 7 .NET Framework 4
- 8 .NET Framework 4.5
- 9 .NET Framework 4.6
- 10 References
|Development tool||Included in||Replaces|
|1.0||1.0||2002-02-13||Visual Studio .NET||XP[a]||N/A||N/A|
|1.1||1.1||2003-04-24||Visual Studio .NET 2003||N/A||2003||1.0|
|2.0||2.0||2005-11-07||Visual Studio 2005||N/A||2003, 2003 R2, 2008 SP2, 2008 R2 SP1||N/A|
|3.0||2.0||2006-11-06||Expression Blend[b]||Vista||2008 SP2, 2008 R2 SP1||2.0|
|3.5||2.0||2007-11-19||Visual Studio 2008||7, 8[c], 8.1[c], 10[c]||2008 R2 SP1||2.0, 3.0|
|4.0||4||2010-04-12||Visual Studio 2010||N/A||N/A||N/A|
|4.5||4||2012-08-15||Visual Studio 2012||8||2012||4.0|
|4.5.1||4||2013-10-17||Visual Studio 2013||8.1||2012 R2||4.0, 4.5|
|4.6||4||2015-07-20||Visual Studio 2015||10||N/A||4.0–4.5.2|
|4.6.1||4||2015-11-30||Visual Studio 2015 Update 1||10 v1511||N/A||4.0–4.6|
- a.^ .NET Framework 1.0 is integral OS component of Windows XP Media Center edition or Tablet PC edition. Installation CDs for the Home editions and the Professional editions of Windows XP SP1, SP2 or SP3 comes with .NET Framework installation packages.
- b.^ Expression Blend only covers the Windows Presentation Foundation part of .NET Framework 3.0.
- c.^ ^ ^ .NET Framework 3.5 is not automatically installed with Windows 8, 8.1 or 10. It must be installed either from a Windows installation media or from the Internet on demand. Control Panel always attempts the latter.
.NET Framework 1.0
The first version of the .NET Framework was released on 13 February 2002 for Windows 98, ME, NT 4.0, 2000, and XP. Mainstream support for this version ended on 10 July 2007, and extended support ended on 14 July 2009, with the exception of Windows XP Media Center and Tablet PC editions.
On 19 July 2001, the tenth anniversary of the release of Visual Basic, .NET Framework 1.0 Beta 2 was released.
.NET Framework 1.0 is supported on Windows 98, ME, NT 4.0, 2000, XP, and Server 2003. Applications utilizing .NET Framework 1.0 will also run on computers with .NET Framework 1.1 installed, which supports additional operating systems.
.NET Framework 1.1
Version 1.1 is the first minor .NET Framework upgrade. It is available on its own as a redistributable package or in a software development kit, and was published on 3 April 2003. It is also part of the second release of Visual Studio .NET 2003. This is the first version of the .NET Framework to be included as part of the Windows operating system, shipping with Windows Server 2003. Mainstream support for .NET Framework 1.1 ended on 14 October 2008, and extended support ended on 8 October 2013. .NET Framework 1.1 is the last version to support Windows NT 4.0.
Installing .NET Framework 1.1 also provides the system support for version 1.0, except in rare instances where an application will not run because it checks the version number of a library.
Changes in 1.1 include:
- Built-in support for mobile ASP.NET controls, which was previously available as an add-on
- Enables Windows Forms assemblies to execute in a semi-trusted manner from the Internet
- Enables Code Access Security in ASP.NET applications
- Built-in support for ODBC and Oracle Database, which was previously available as an add-on
- .NET Compact Framework, a version of the .NET Framework for small devices
- Internet Protocol version 6 (IPv6) support
.NET Framework 2.0
Version 2.0 was released on 22 January 2006. It was also released along with Visual Studio 2005, Microsoft SQL Server 2005, and BizTalk 2006. A software development kit for this version was released on 29 November 2006. It was the last version to support Windows 98 and Windows Me.
.NET Framework 2.0 with Service Pack 2 requires Windows 2000 with SP4 plus KB835732 or KB891861 update, Windows XP with SP2 plus Windows Installer 3.1. It is the last version to support Windows 2000 although there have been some unofficial workarounds to use a subset of the functionality from Version 3.5 in Windows 2000.
Changes in 2.0 include:
- Full 64-bit computing support for both the x64 and the IA-64 hardware platforms
- Numerous API changes[which?]
- Microsoft SQL Server integration: Instead of using T-SQL, one can build stored procedures and triggers in any of the .NET-compatible languages
- A new hosting API for native applications wishing to host an instance of the .NET runtime: The new API gives a fine grain control on the behavior of the runtime with regards to multithreading, memory allocation and assembly loading. It was initially developed to efficiently host the runtime in Microsoft SQL Server, which implements its own scheduler and memory manager.
- Many additional and improved ASP.NET web controls[which?]
- New data controls[which?] with declarative data binding
- New personalization features for ASP.NET, such as support for themes, skins, master pages and webparts
- .NET Micro Framework, a version of the .NET Framework related to the Smart Personal Objects Technology initiative
- Membership provider
- Partial classes
- Nullable types
- Anonymous methods
- Data tables
- Common Language Runtime (CLR) 2.0
- Language support for generics built directly into the .NET CLR
.NET Framework 2.0 is supported on Windows 98, ME, 2000, XP, Server 2003, Vista, Server 2008, and Server 2008 R2. Applications utilizing .NET Framework 2.0 will also run on computers with .NET Framework 3.0 or 3.5 installed, which supports additional operating systems.
.NET Framework 3.0
.NET Framework 3.0, formerly called WinFX, was released on 21 November 2006. It includes a new set of managed code APIs that are an integral part of Windows Vista and Windows Server 2008. It is also available for Windows XP SP2 and Windows Server 2003 as a download. There are no major architectural changes included with this release; .NET Framework 3.0 uses the same CLR as .NET Framework 2.0. Unlike the previous major .NET releases there was no .NET Compact Framework release made as a counterpart of this version. Version 3.0 of the .NET Framework shipped with Windows Vista. It also shipped with Windows Server 2008 as an optional component (disabled by default).
.NET Framework 3.0 consists of four major new components:
- Windows Presentation Foundation (WPF), formerly code-named Avalon: A new user interface subsystem and API based on XAML markup language, which uses 3D computer graphics hardware and Direct3D technologies
- Windows Communication Foundation (WCF), formerly code-named Indigo: A service-oriented messaging system which allows programs to interoperate locally or remotely similar to web services
- Windows Workflow Foundation (WF): Allows building task automation and integrated transactions using workflows
- Windows CardSpace, formerly code-named InfoCard: A software component which securely stores a person's digital identities and provides a unified interface for choosing the identity for a particular transaction, such as logging in to a website
.NET Framework 3.0 is supported on Windows XP, Server 2003, Vista, Server 2008, and Server 2008 R2. Applications utilizing .NET Framework 3.0 will also run on computers with .NET Framework 3.5 installed, which supports additional operating systems.
.NET Framework 3.5
Version 3.5 of the .NET Framework was released on 19 November 2007. As with .NET Framework 3.0, version 3.5 uses Common Language Runtime (CLR) 2.0, that is, the same version as .NET Framework version 2.0. In addition, .NET Framework 3.5 also installs .NET Framework 2.0 SP1 and 3.0 SP1 (with the later 3.5 SP1 instead installing 2.0 SP2 and 3.0 SP2), which adds some methods and properties to the BCL classes in version 2.0 which are required for version 3.5 features such as Language Integrated Query (LINQ). These changes do not affect applications written for version 2.0, however.
As with previous versions, a new .NET Compact Framework 3.5 was released in tandem with this update in order to provide support for additional features on Windows Mobile and Windows Embedded CE devices.
Service Pack 1 
The .NET Framework 3.5 Service Pack 1 was released on 11 August 2008. This release adds new functionality and provides performance improvements under certain conditions, especially with WPF where 20–45% improvements are expected. Two new data service components have been added, the ADO.NET Entity Framework and ADO.NET Data Services. Two new assemblies for web development, System.Web.Abstraction and System.Web.Routing, have been added; these are used in the ASP.NET MVC framework and, reportedly, will be used in the future release of ASP.NET Forms applications. Service Pack 1 is included with SQL Server 2008 and Visual Studio 2008 Service Pack 1. It also featured a new set of controls called "Visual Basic Power Packs" which brought back Visual Basic controls such as "Line" and "Shape". Version 3.5 SP1 of the .NET Framework shipped with Windows 7. It also shipped with Windows Server 2008 R2 as an optional component (disabled by default).
.NET Framework 3.5 SP1 Client Profile
For the .NET Framework 3.5 SP1 there is also a new variant of the .NET Framework, called the ".NET Framework Client Profile", which at 28 MB is significantly smaller than the full framework and only installs components that are the most relevant to desktop applications. However, the Client Profile amounts to this size only if using the online installer on Windows XP SP2 when no other .NET Frameworks are installed or using Windows Update. When using the off-line installer or any other OS, the download size is still 250 MB.
.NET Framework 4
Key focuses for this release are:
- Parallel Extensions to improve support for parallel computing, which target multi-core or distributed systems. To this end, technologies like PLINQ (Parallel LINQ), a parallel implementation of the LINQ engine, and Task Parallel Library, which exposes parallel constructs via method calls, are included.
- New Visual Basic .NET and C# language features, such as implicit line continuations, dynamic dispatch, named parameters, and optional parameters
- Support for Code Contracts
- Inclusion of new types to work with arbitrary-precision arithmetic (System.Numerics.BigInteger) and complex numbers (System.Numerics.Complex)
- Introduced Common Language Runtime (CLR) 4.0
.NET Framework 4.0 is supported on Windows Server 2003, Vista, Server 2008, 7 and Server 2008 R2. Applications utilizing .NET Framework 4.0 will also run on computers with .NET Framework 4.5 or 4.6 installed, which supports additional operating systems.
Microsoft announced the intention to ship .NET Framework 4 on 29 September 2008. The Public Beta was released on 20 May 2009.
On 28 July 2009, a second release of the .NET Framework 4 beta was made available with experimental software transactional memory support. This functionality is not available in the final version of the framework.
On 19 October 2009, Microsoft released Beta 2 of the .NET Framework 4. At the same time, Microsoft announced the expected launch date for .NET Framework 4 as 22 March 2010. This launch date was subsequently delayed to 12 April 2010.
On 18 April 2011, version 4.0.1 was released supporting some customer-demanded fixes for Windows Workflow Foundation. Its design-time component, which requires Visual Studio 2010 SP1, adds a workflow state machine designer.
Version 4.0.3 was released on 4 March 2012.
Windows Server AppFabric
After the release of the .NET Framework 4, Microsoft released a set of enhancements, named Windows Server AppFabric, for application server capabilities in the form of AppFabric Hosting and in-memory distributed caching support.
.NET Framework 4.5
.NET Framework 4.5 was released on 15 August 2012; a set of new or improved features were added into this version. The .NET Framework 4.5 is only supported on Windows Vista or later. The .NET Framework 4.5 uses Common Language Runtime 4.0, with some additional runtime features.
.NET Framework 4.5 is supported on Windows Vista, Server 2008, 7, Server 2008 R2, 8, Server 2012, 8.1 and Server 2012 R2. Applications utilizing .NET Framework 4.5 will also run on computers with .NET Framework 4.6 installed, which supports additional operating systems.
.NET for Metro-style apps
- Ability to limit how long the regular expression engine will attempt to resolve a regular expression before it times out.
- Ability to define the culture for an application domain.
- Console support for Unicode (UTF-16) encoding.
- Support for versioning of cultural string ordering and comparison data.
- Better performance when retrieving resources.
- Native support for Zip compression (previous versions supported the compression algorithm, but not the archive format).
- Ability to customize a reflection context to override default reflection behavior through the CustomReflectionContext class.
- New asynchronous features were added to the C# and Visual Basic languages. These features add a task-based model for performing asynchronous operations, implementing futures and promises.
Managed Extensibility Framework (MEF)
The Managed Extensibility Framework or MEF is a library for creating lightweight, extensible applications. It allows application developers to discover and use extensions with no configuration required. It also lets extension developers easily encapsulate code and avoid fragile hard dependencies. MEF not only allows extensions to be reused within applications, but across applications as well.
- 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.
- Improved handling of client script through bundling and minification for improved page performance.
- Integrated encoding routines from the Anti-XSS library (previously an external library) to protect from cross-site scripting attacks.
- Support for WebSocket 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.
- Provides a new programming interface for HTTP applications: System.Net.Http namespace and System.Net.Http.Headers namespaces are added
- Improved internationalization and IPv6 support
- RFC-compliant URI support
- Support for internationalized domain name (IDN) parsing
- Support for Email Address Internationalization (EAI)
.NET Framework 4.5.1
The release of .NET Framework 4.5.1 was announced on 17 October 2013 along Visual Studio 2013. This version requires Windows Vista SP2 and later and is included with Windows 8.1 and Windows Server 2012 R2. New features of .NET Framework 4.5.1:
- Debugger support for X64 edit and continue (EnC)
- Debugger support for seeing managed return values
- Async-aware debugging in the Call Stack and Tasks windows
- Debugger support for analyzing .NET memory dumps (in the Visual Studio Ultimate SKU)
- Tools for .NET developers in the Performance and Diagnostics hub
- Code Analysis UI improvements
- ADO.NET idle connection resiliency
.NET Framework 4.5.2
The release of .NET Framework 4.5.2 was announced on 5 May 2014. For Windows Forms applications, improvements were made for high DPI scenarios. For ASP.NET, higher reliability HTTP header inspection and modification methods are available as is a new way to schedule background asynchronous worker tasks.
.NET Framework 4.6
.NET Framework 4.6 was announced on 12 November 2014. It was released on 20 July 2015. It supports a new just-in-time compiler (JIT) for 64-bit systems called RyuJIT, which features higher performance and support for SSE2 and AVX2 instruction sets. WPF and Windows Forms both have received updates for high DPI scenarios. Support for TLS 1.1 and TLS 1.2 has been added to WCF. This version requires Windows Vista SP2 or later.
The cryptographic API in .NET Framework 4.6 uses the latest version of Windows CNG cryptography API. As a result, NSA Suite B Cryptography is available to .NET Framework. Suite B consists of AES, the SHA-2 family of hashing algorithms, elliptic curve Diffie–Hellman, and elliptic curve DSA.
.NET Framework 4.6 is supported on Windows Vista, Server 2008, 7, Server 2008 R2, 8, Server 2012, 8.1, Server 2012 R2, 10 and Server 2016. However, .NET Framework 4.6.1 and 4.6.2 drops support for Windows Vista and Server 2008.
.NET Framework 4.6.1
- WPF improvements for spell check, support for per-user custom dictionaries and improved touch performance.
- Enhanced support for Elliptic Curve Digital Signature Algorithm (ECDSA) X509 certificates.
- Added support in SQL Connectivity for AlwaysOn, Always Encrypted and improved connection open resiliency when connecting to Azure SQL Database.
- Azure SQL Database now supports distributed transactions using the updated System.Transactions APIs .
- Many other performance, stability, and reliability related fixes in RyuJIT, GC, WPF and WCF.
.NET Framework 4.6.2
- Support for paths longer than 260 characters
- Support for FIPS 186-3 DSA in X.509 certificates
- TLS 1.1/1.2 support for ClickOnce
- Support for localization of data annotations in ASP.NET
- Enabling .NET desktop apps with Project Centennial
- Soft keyboard and per-monitor DPI support for WPF
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The team is updating the System.Security.Cryptography APIs to support the Windows CNG cryptography APIs [...] since it supports modern cryptography algorithms [Suite B Support], which are important for certain categories of apps.
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