Now available: .NET 4.5.1
.NET Framework 4.5.1 is a highly compatible, in-place update to the .NET Framework 4 and the .NET Framework 4.5.Install it today
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What is .NET?
.NET is an integral part of many applications running on Windows and provides common functionality for those applications to run. This download is for people who need .NET to run an application on their computer. For developers, the .NET Framework provides a comprehensive and consistent programming model for building applications that have visually stunning user experiences and seamless and secure communication.
Clinical trials lab moves the development of mission-critical app from Java to .NET
CoreLab switched to the Visual Studio IDE and Visual Studio Team Foundation Server to develop its cutting-edge imaging application.
Insurance company uses .NET to quickly develop its Windows Phone app
Geico used the .NET Framework to produce its app for Windows Phone—using prerelease code—40 percent faster than it had developed the iPhone version.
IT services provider migrates from mainframe, boosts agility
SDC decided to move its core banking system from a mainframe to a more modern platform. It also successfully moved its mission-critical system from Java to the .NET Framework.
Telecommunications service provider drives dev opportunities with cloud and mobile services
Telefónica forged a partnership with Microsoft to create BlueVia SDK for .NET, a set of technologies that accelerate the use of BlueVia by developers using the Microsoft platform.
Toolkit eases cloud development and deployment
Working with technology partner Neudesic, Rackspace created the Visual Studio 2010 Plug-In for the Rackspace Cloud, which speeds cloud application development and deployment.
Manufacturer uses cloud computing to solve customers’ needs, grow business
Orion Energy Systems used the .NET Framework to build a tool that enables large customers to compare energy consumption across sites so that they could improve their facilities' operations.
Software company improves testing and debugging efficiency by 20 percent
By adopting Microsoft Visual Studio 2010 for application lifecycle management, K2 gained better visibility into project status, an improved build environment, and more efficient testing.
New securities-trading platform delivers rich user experience and greater flexibility
UNX used the Microsoft .NET Framework to build Catalyst, a desktop trading application that can easily be adapted for its customers' needs.
Get .NET development tools
Microsoft Visual Studio is a powerful IDE that ensures quality code throughout the entire application lifecycle, from design to deployment.Learn more about Visual Studio
.NET Universe 2013 Poster
.NET Universe Poster (2013) shows the main .NET SDKs, libraries and packages classified by application type and package type. View full screen or zoom in and out to explore.Explore the .NET Universe