History of .net framework versions

4.5.1

Visual Studio 2013

Includes performance and debugging improvements

Support for automatic binding redirection

Expanded support for Windows Store apps

4.5

Visual Studio 2012

Features Enhancements to CLR 4.0

Async Support

Support for building Windows Store apps

Features Enhancement to WPF, WCF, WF, and ASP.NET

4.0

Visual Studio 2010

Introduced CLR 4.0

Managed Extensibility Framework (MEF)

Dynamic Language Runtime (DLR)

Task Parallel Library

3.5

Visual Studio 2008

Built-In AJAX Support

LINQ

Dynamic Data

Multi-targeting Framework Support

3.0

Visual Studio 2005

Windows Presentation Foundation (WPF)

Windows Communications Foundation (WCF)

Windows Workflow Foundation (WF), and CardSpace

2.0

Visual Studio 2005

Introduced CLR 2.0

Generics and generic collections

Partial classes

Nullable types

Anonymous methods

Introduced many new controls and features to ASP.NET

1.1

Visual Studio .NET 2003

Features Enhancement to ASP.NET and ADO.NET

Built-in support for mobile ASP.NET controls

Security Enhancement

Built-in support for ODBC and databases

Internet Protocol version 6 (IPv6) support

1.0

Visual Studio .NET

Introduced CLR 1.0

Support for Object-oriented Web application development

Use of DLL class libraries