This TechEd Europe 2014 video showing you how to combine Webform with Web Api. This talk also show you what is the new js that going to come as default in Visual Studio 2015.
This is the synopsis of the video on Visual Studio 2013:
Learn about the latest features in Visual Studio 2013, including dozens of tips and tricks for building web applications using ASP.NET and Visual Studio 2013. Learn about the new HTML5 editor, new powerful CSS3 features, great new innovations in publishing and Microsoft Azure integration, and much more. We also push the new Browser Link technology to its limits and beyond, explore what mobile and multi-browser development looks like with Visual Studio 2013, as well as look at new ways to run Web API or SignalR that use significantly less memory.