The .NEI' Framework provides a unified, object-oriented, hierarchical, extensible set of class libraries APIs) for developers to use. Developers of C++ use the Microsoft Foundation Classes, Java developers of Java use the Windows Foundation Classes, and the developers of Visual Basic use Visual Basic APIs. The .NET Framework unifies the disparate frameworks Microsoft has today. As a result, developers no longer have to learn multiple frameworks to do their work. But more than that, by creating a common set of APIs across all programming languages, the .NET Framework enables cross-language inheritance, error handling, and debugging, in effect, all programming languages, from J Script to C++, become equal and developers are free to choose the language that they want to use.
Active Server Pages+ (ASP+ or ASP.NET)
ASP+ builds on the programming classes of the .NET Framework, providing a Web application model in the form of a set of controls and infrastructure that make it simple to build Web applications. Developers are exposed to a set of ASP+ controls that encapsulate common Hypertext Markup Language (HTML) user interface widgets such as text boxes, drop-down menus, and so on. These controls actually run on the Web Server and project their user interface as HTML to a browser. On the 'server, the controls expose an object-oriented programming model that brings the richness of object oriented programming to the Web developer. ASP+ also provides infrastructure services such as session state management and process recycling that further reduce the amount of code a developer must write and increase application reliability. ASP+ also uses these concepts to enable developers to deliver software as a service. Using ASP+ Web Services features, ASP+ developers can simply write .net programs.
The upper-most layer includes all the languages supported by the .NET framework.. At present ,NET framework supports almost 20 languages, At the first glance it seem as if all the technologies participating in the .NET framework are more or less Microsoft products, But it is not true. Some third party vendor can provide the web services supported by the ASP.NET layer. Also since .NET framework is more of a specification, technology vendors can use these specifications to develop their own products such as SDKs, IDEs, Complilers etc. for windows or other platforms. All the five layers are fully supported in the Visual Studio,NET IDE provided
by Microsoft with the .NET framework, Although you can write your code in any text editor such as notepad, Visual Studio gives you an environment in which you can develop applications easily and faster than in the conventional programming tools. Now let us have a detailed look at the components involved. Now let us discuss some of these components in detail,
Win Forms Application Model
