ASP.NET, an open-source server-side web application framework was first released in January 2002 with the version 1.0 of .NET framework. It is a successor to Active Server Technology (ASP) by Microsoft. The successor to ASP.NET is ASP.NET Core which is ASP.NET’s reimplementation as a modular framework in conjunction with other frameworks like Entity Framework.

ASP Dot Net Version History

The version release history of ASP.NET tightly correlates the release history of .NET Frameworks.

Various ASP.NET Versions released till now includes ASP.NET 5RC1, ASP.NET 4.6, ASP.NET 4.5.2, ASP.NET 4.5.1, ASP.NET 4.5, ASP.NET 4.0, ASP.NET 3.5, ASP.NET 2.0, ASP.NET 1.1, and ASP.NET 1.0. Here’s a brief about all these ASP.NET versions.


Version: 5 RC1, now ASP.NET Core

Release Date: 8th November, 2015

Version Features: Entirely new project with different development goals and tenets

Remarks: Though supposed to be the latest version of ASP.NET, it was separated and released as a new project – ASP.NET Core.


Version: 4.6

Release Date: 20th July, 2015

Version Features: HTTP/2 support – when running on Windows 10, Better async task-returning APIs, Released with Visual Studio 2015, EF7 previews for Windows 10 and Windows Server 2016


Version: 4.5.2

Release Date: 5th May, 2014

Version Features: More reliable HTTP header inspection and modification methods, new method to schedule background asynchronous worker tasks.


Version: 4.5.1

Release Date: 17th October, 2013

Version Features: Bootstrap 3.0, MVC 5: Authentication filters and filter overrides with attribute routing, Web API 2: OAuth 2.0, Released for Windows server 2012 R2 and Windows 8.1 with Visual Studio 2013

Version: 4.5

Release Date: 15th August, 2012

Version Features: HTML 5 enhancements, Support for WebSocket protocol, Model Binding, Bundling and Minification


Version: 4.0

Release Date: 12th April, 2010

Version Features: ClientIdMode property introduced for Server Control, Meta Tags Meta Keywords and Meta Description introduced, Chart Control, Routing


Version: 3.5

Release Date: 19th November, 2007

Version Features: Released with Server 2008 and Visual Studio 2008, integrated ASP.NET AJAX, support for HTTP pipelining and syndication feeds, support LINQ, multi-targeting framework support


Version: 2.0

Release Date: 7th November, 2005

Version Features: New data controls (Form View, Grid View, Details View), Master Pages, New Techniques (SqlDataSource, XMLDataSource, ObjectDataSource Controls) for declarative data access, support for 64-bit processors, full pre-compilation, themes and skins, new localization technique


Version: 1.1

Release Date: 24th April, 2003

Version Features: Released together with Visual Studio .NET 2003 and Windows Server 2003, mobile controls, IPv6 support, automatic input validation, built-in support for ODBC and databases.


Version: 1.0

Release Date: 16th January, 2002

Version Features: Released together with Visual Studio .NET. Inheritance supporting object-oriented Web Application Development, use of DLL class libraries


This article is curated keeping in mind the curiosity of developers who want to know about ASP Dot NET Versions and its feature advancements in every version.

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