At last week's Build 2015 developer conference Microsoft revealed how ASP.NET has been updated for Visual Studio 2015.

The ASP.NET team has updated ASP.NET 4.6 and ASP.NET 5 for inclusion in the preview release of Visual Studio. The release candidate for ASP.NET 5 is included in the preview, with most of the attention having been on fit-and-finish, performance and reliability according to a post from Rich Lander on the .NET blog. Support for Visual Basic has also been added.

Backing up the new version of ASP.NET is a reworked New ASP.NET Project dialog in Visual Studio. ASP.NET 4.6 and ASP.NET 5 are clearly divided, making it easy to choose which type of app you want to build. The ASP.NET 5 section has fewer choices since more of the scenarios are integrated now.

Another improvement is support for finding missing NuGet packages that are referenced in your projects in a similar way to the way you can resolve missing namespace references for types.

While ASP.NET 5 has reached Release Candidate, ASP.NET 4.6 is still being developed, with updates including Web Forms, MVC 5 and Web API 2, support for the .NET Compiler Platform (Roslyn), and hosting changes in IIS to support HTTP/2.

The support for Roslyn in the new version lets you use the new language features of C# and VB in any ASP.NET 4.6 project. Model binding has been extended for Web Forms with support for Async Model Binding which lets you write Asynchronous Model Binding actions.

HTTP/2 support has also been added to ASP.NET in the .NET Framework 4.6. The fact that networking functionality exists at various layers in Windows 10 means that new features were required in Windows, in IIS and in ASP.NET to enable HTTP/2. This is a new version of the HTTP protocol that makes much better use of connections by making fewer round-trips between client and server, so speeding up web page loading for users. 

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