.NET Framework 4.0

he .NET Framework is Microsoft`s managed code programming model for building applications on Windows clients, servers, and mobile or embedded devices. Developers use .NET to build applications of many types: Web applications, server applications, smart client applications, console applications, database applications, and more.
To support this variety, the .NET Framework includes a broad set of supporting class libraries, including: Windows Presentation Foundation (WPF), for visually stunning user experiences on Windows clients; Windows Communication Foundation (WCF), enabling fast and flexible communications among applications across your enterprise; Windows Workflow Foundation (WF), allowing developers to build workflows into any application; ASP.NET, for high-performance and interactive Web-based applications; Libraries for handling XML, data, IO, cryptography, text-to-speech, and more.