What is New in ASP.NET 4 Web Development
Microsoft Recently Microsoft introduce Visual Studio 2010 which have new feature's Name of some new Features are given below
.NET 4 release, with a focus on making your development experience easier. The key new features in the .NET Framework 4 including MEF, improvements in ASP.NET, threading, multi-core and parallel extensions, additions to the base classes, changes and additions to the CLR and DLR, what's new for the languages (Visual Basic and C#), and of course, what's new in Windows Presentation Foundation and System.Web. Come and see how all these new features and capabilities improve your overall .NET experience! In ASP.NET 4.O has focus on performance and Search Engine Optimization. I'll be taking a look at what I think are the most important new features in ASP.NET 4.
* Output cache extensibility
* Session state compression
* View state mode for individual control
* Page.MetaKeyword and Page.MetaDescription properties
* Response.RedirectPermanent method
* Routing in ASP.NET
* Increase the URL character length
* New syntax for HTML Encode
* Predictable Client IDs
* Web.config file refactoring
* Auto-Start ASP.NET applications
* Improvements on Microsoft Ajax Library
Reference:http://www.asp.net/LEARN/whitepapers/aspnet4/
Reference: http://www.aspxtutorial.com/post/2010/05/03/What-is-New-in-ASPNET-4-Web-Development.aspx