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    ASP.NET is an open-source server-side web-application framework designed for web development to produce dynamic web pages developed by Microsoft to allow programmers to build dynamic web sites, applications and services.

    It was first released in January 2002 with version 1.0 of the .NET Framework, and is the successor to Microsoft's Active Server Pages ASP technology. ASP.NET is built on the Common Language Runtime CLR, allowing programmers to write ASP.NET code using any supported .NET language. The ASP.NET SOAP extension framework allows ASP.NET components to process SOAP messages.

    ASP.NET's successor is ASP.NET Core. It is a re-implementation of ASP.NET as a modular web framework, together with other frameworks like Entity Framework. The new framework uses the new open-source .NET Compiler Platform codename "Roslyn" and is cross platform. ASP.NET MVC, ASP.NET Web API, and ASP.NET Web Pages a platform using only Razor pages have merged into a unified MVC 6.

    Programming models

    ASP.NET supports a number of programming models for building web applications:

    Other ASP.NET extensions include:

    IIS integrated pipeline

    On IIS 6.0 and lower, pages written using different versions of the ASP framework cannot share session state without the use of third-party libraries. This does not apply to ASP.NET and ASP applications running side by side on IIS 7. With IIS 7.0, modules may be run in an integrated pipeline that allows modules written in any language to be executed for any request.

    Third-party frameworks

    It is not essential to use the standard Web forms development model when developing with ASP.NET. Noteworthy frameworks designed for the platform include:


    The ASP.NET releases history tightly correlates with the .NET Framework releases:

    released together with Visual Studio .NET

    released together with Visual Studio .NET 2003

    codename Whidbey released together with Visual Studio 2005 and Visual Web Developer Express and SQL Server 2005

    Parallel extensions and other .NET Framework 4 features

    The two new properties added in the Page class are MetaKeyword and MetaDescription.

    Parallel extensions and other .NET Framework 4.5 features

    Other implementations

    The Mono Project supports "everything in .NET 4.5 except WPF, WWF, and with limited WCF and limited ASP.NET 4.5 async stack." ASP.NET can be run with Mono using one of three options:- Apache hosting using the mod_mono module, FastCGI hosting, and XSP.

    Some top .net based CMS are: DNN, Sitefinity, Umbraco, Orchard, Kentico, Sitecore and MojoPortal.