.Net 4.0 is latest technology and it provide Extra features then previous version.

There are added new features in this section of .net as given

o   Application Compatibility and Development

o   Managed Extensibility Framework

o   Networking

o   Web

o   Client

o   Data

o   Windows communication foundation

o Windows workflow foundation etc

Main Features in .Net

o   Routing concept in .Net

o   Page.MetaKeyword and Page.Description Properties

o   More data services in WCF

o   Output Caching Extensibility

o   Session State Compression

o   Improvements on Microsoft Ajax Library

o   Adding new Syntax for Html Encode

o   Response.RedirectPermanent method

o   Increase URL character length

o   Auto start ASP.Net application

o   Web Config file refactoring

o   Predictable ClientId