First we know that is: The. Net Framework is the programming model of Microsoft’s managed code to build applications that provide visually stunning user experiences, secure communication and uniform, and the ability to present a range of business processes. With these new features added. Dennis Carey NET Framework 3.5 builds more and better que.NET Framework 3.0. The difference can be noted, for example, Windows Workflow Foundation (WF), Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF) and Windows CardSpace. In addition,. NET Framework 3.5 offers several new features related to different technology areas, which have been added as new assemblies to avoid too abrupt changes. These functions have the following characteristics: Depth integration between LINQ (Language Integrated Query) and data management.This feature allows using the same syntax, writing code in languages that support LINQ to filter, enumerate and create projections of several types of SQL data, collections, XML, and DataSets. Support for a new protocol, in order to mount WCF services including AJAX, JSON, REST, POX, RSS, ATOM, and several new WS standards. Full support in Visual Studio2008 for WF, WCF and WPF including the new technology enabled services for different workflows. New classes in the basic class library (BCL in English). NET Framework 3.5, which is the most common requests made by customers.