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.
|Development tool||Included in||Replaces|
|1.0||1.0||2002-02-13||2009-07-14||Visual Studio .NET||XP SP1[a]||N/A||N/A|
|1.1||1.1||2003-04-24||Visual Studio .NET 2003||XP SP2, SP3[b]||2003||1.0|
|2.0||2.0||2005-11-07||2011-07-12||Visual Studio 2005||N/A||2003, 2003 R2,2008 SP2, 2008 R2 SP1||N/A|
|3.0||2.0||2006-11-06||2011-07-12||Expression Blend[c]||Vista||2008 SP2, 2008 R2 SP1||2.0|
|3.5||2.0||2007-11-19||2011-07-12||Visual Studio 2008||7, 8, 8.1, 10[d]||2008 R2 SP1||2.0, 3.0|
|4.0||4||2010-04-12||2016-01-12||Visual Studio 2010||N/A||N/A||N/A|
|4.5||4||2012-08-15||2016-01-12||Visual Studio 2012||8||2012||4.0|
|4.5.1||4||2013-10-17||2016-01-12||Visual Studio 2013||8.1||2012 R2||4.0, 4.5|
|4.6||4||2015-07-20||N/A||Visual Studio 2015||10||N/A||4.0-4.5.2|
|4.6.1||4||2015-11-30||N/A||Visual Studio 2015 Update 1||10 v1511||N/A||4.0-4.6|
|4.7||4||2017-04-05||N/A||Visual Studio 2017||10 v1703||N/A||4.0-4.6.2|
|4.7.1||4||2017-10-17||N/A||Visual Studio 2017||10 v1709||N/A||4.0-4.7|
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.
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:
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:
.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, 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:
.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.
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.
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).
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.
Key focuses for this release are:
.NET Framework 4.0 is supported on Windows XP (with Service Pack 3), 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. .NET Framework 4.0 is the last version to support Windows XP and Windows Server 2003.
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.
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 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.
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.
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:
The release of .NET Framework 4.5.2 was announced on 5 May 2014. This version requires Windows Vista SP2 and later. 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 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, and .NET Framework 4.6.2 drops support for Windows 8.
On 5 April 2017, Microsoft announced that .NET Framework 4.7 was integrated into Windows 10 Creators Update, promising a standalone installer for other Windows versions. An update for Visual Studio 2017 was released on this date to add support for targeting .NET Framework 4.7. The promised standalone installer for Windows 7 and later was released on 2 May 2017, but it had prerequisites not included with the package.
New features in .NET Framework 4.7 include:
Visual Studio .NET 2002 shipped with the Microsoft .NET Framework SDK version 1.0. Visual Studio .NET 2003 ships with .NET Framework SDK version 1.1.
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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