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More control over HTML, element IDs and custom CSS that make it much easier to create standards-compliant and SEO-friendly web forms.

Built-in integration with Microsoft Office 2010 now makes it possible to expose Microsoft Office SharePoint Server data as an OData feed and access that data feed by using the WCF Data Services client library. WCF Data Services has many new features, including enhanced BLOB support, data binding, row count, feed customization, projections, and request pipeline improvements. NET Framework that enables you to create REST-based services and applications that use the Open Data Protocol (OData) to expose and consume data over the Web.

WCF Data Services is a component of the.Additional features include better n-tier support with self-tracking entities, customizable code generation using T4 templates, model first development, an improved designer experience, better performance, and pluralization of entity sets. It has many new features, including persistence ignorance and POCO support, foreign key associations, lazy loading, test-driven development support, functions in the model, and new LINQ operators. NET objects and Language Integrated Query (LINQ). The Entity Framework enables developers to program against relational databases using.Improvements in Data Access and Modeling.Innovations in the Visual Basic and C# languages, for example statement lambdas, implicit line continuations, dynamic dispatch, and named/optional parameters.For a comprehensive list of enhancements to CLR and BCL go here.Easier debugging including dump debugging, Watson minidumps, mixed mode debugging for 64 bit and code contracts.

New memory mapped file and numeric types.

Performance improvement including better multicore support, background garbage collection, and profiler attach on server.

Improvements in Common Language Runtime (CLR) and Base Class Library (BCL).

NET Framework 4 provides the following new features and improvements:

Applications that are based on earlier versions of the Framework will continue to run on the version targeted by default.

NET Framework 4 works side by side with older Framework versions. NET Framework is Microsoft's comprehensive and consistent programming model for building applications that have visually stunning user experiences, seamless and secure communication, and the ability to model a range of business processes.