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".NET" redirects here. For the top-level Internet domain, see .net. For other uses, see .NET (disambiguation).

.NET Framework

Microsoft .NET Framework v4.5 logo.png

Developer(s) Microsoft

Initial release 13 February 2002; 12 years ago

Stable release 4.5.1 (4.5.50938.18408) / 17 October 2013; 4 months ago

Operating system Windows 98 or later, Windows NT 4.0 or later

Type Software framework

License Proprietary; BCL under Microsoft Reference Source License[1]

Website www.microsoft.com/net

.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 .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 .NET Framework.

.NET Framework's Base Class Library provides user interface, data access, database connectivity, cryptography, web application development, numeric algorithms, and network communications. Programmers produce software by combining their own source code with .NET Framework and other libraries. .NET Framework is intended to be used by most new applications created for the Windows platform. Microsoft also produces an integrated development environment largely for .NET software called Visual Studio