The .NET Framework (pronounced dot net) is a software framework developed by Microsoft that runs primarily on Microsoft Windows. It includes a large library and provides language interoperability (each language can use code written in other languages) across several programming languages. Programs written for the .NET Framework execute in a software environment (as contrasted to hardware environment), known as the Common Language Runtime (CLR), an application virtual machine that provides services such as security, memory management, and exception handling. The class library and the CLR together constitute the .NET Framework.
Microsoft started development of 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.
Microsoft started development of 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.
| Generation | Version number | Release date | Development tool | Distributed with |
|---|---|---|---|---|
| 1.0 | 1.0.3705.0 | 2002-02-13 | Visual Studio .NET | N/A |
| 1.1 | 1.1.4322.573 | 2003-04-24 | Visual Studio .NET 2003 | Windows Server 2003 |
| 2.0 | 2.0.50727.42 | 2005-11-07 | Visual Studio 2005 | Windows Server 2003 R2 |
| 3.0 | 3.0.4506.30 | 2006-11-06 | Expression Blend | Windows Vista, Windows Server 2008 |
| 3.5 | 3.5.21022.8 | 2007-11-19 | Visual Studio 2008 | Windows 7, Windows Server 2008 R2 |
| 4.0 | 4.0.30319.1 | 2010-04-12 | Visual Studio 2010 | N/A |
| 4.5 | 4.5.50709.17929 | 2012-08-15 | Visual Studio 2012 | Windows 8, Windows Server 2012 |
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