.NET Framework Version 4.5 Latest

^{MS .net}

The .NET Framework is Microsoft's comprehensive and consistent programming model for building applications that have visually stunning user experiences, seamless and secure communication, and the ability to model a range of business processes.
The Microsoft .NET Framework 4 redistributable package installs the .NET Framework runtime and associated files that are required to run and develop applications to target the .NET Framework 4.
The .NET Framework 4 works side by side with older Framework versions. Applications that are based on earlier versions of the Framework will continue to run on the version targeted by default.
.NET Framework 4 includes the following new features and improvements:

• Improvements in CLR and BCL
• Improvements in ADO.NET
• Enhancements to ASP.NET
• Improvements in Windows Presentation Foundation
• Improvements to Windows Workflow Foundation and Windows Communication Foundation

Microsoft started development on the .NET Framework in the late 1990s originally under the name of Next Generation Windows Services (NGWS). By late 2000 the first beta versions of .NET 1.0 were released.^[1]
Version 3.0 of the .NET Framework is included with Windows Server 2008 and Windows Vista. Version 3.5 is included with Windows 7, and can also be installed on Windows XP and the Windows Server 2003 family of operating systems.^[2] On 12 April 2010, .NET Framework 4 was released alongside Visual Studio 2010.
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.

History

Microsoft announced the intention to ship .NET Framework 4 on 29 September 2008. The Public Beta was released on 20 May 2009.^[16]
On 28 July 2009, a second release of the .NET Framework 4 beta was made available with experimental software transactional memory support.^[17] 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.^[18] At the same time, Microsoft announced the expected launch date for .NET Framework 4 as the 22 March 2010.^[18] This launch date was subsequently delayed to 12 April 2010.^[19]
On 10 February 2010, a release candidate was published: Version:RC.^[20]
On 12 April 2010, the final version of .NET Framework 4.0 was launched alongside the final release of Visual Studio 2010.
On 18 April 2011, version 4.0.1 was released supporting some customer-demanded fixes for Windows Workflow Foundation.^[21] Its design-time component, which requires Visual Studio 2010 SP1, adds a workflow state machine designer.^[22]
On 19 October 2011, version 4.0.2 was released supporting some new features of Microsoft SQL Server.^[23]

Windows Server AppFabric

After the release of the .NET Framework 4, Microsoft released a set of enhancements, named Windows Server AppFabric,^[24] for application server capabilities in the form of AppFabric Hosting^[25][26] and in-memory distributed caching support.

.NET Framework 4.5

.NET Framework 4.5 was released on 15 August 2012.,^[27] a set of new or improved features were added into this version.^[28] The .NET Framework 4.5 is only supported on Windows Vista or later.^[29][30]

.NET for Metro style apps

Metro style apps are designed for specific form factors and leverage the power of the Windows operating system. A subset of the .NET Framework is available for building Metro style apps for Windows 8 using C# or Visual Basic. This subset is called .NET APIs for Metro style apps.
The version of .NET Framework, runtime and libraries, used for Metro style apps is a part of the new Windows Runtime, which is the new platform and application model for Metro style apps. It is an ecosystem that houses many platforms and languages, including .NET, C++ and HTML5/Javascript.

Framework Core

Core Features

• 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.
• Zip compression improvements to reduce the size of a compressed file.
• Ability to customize a reflection context to override default reflection behavior through the CustomReflectionContext class.

Managed Extensibility Framework (MEF)

• Support for generic types.
• Convention-based programming model that enables you to create parts based on naming conventions rather than attributes.
• Multiple scopes.

Asynchronous 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.

ASP.NET

• 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 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.

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