Web forms bring the ease of Windows application development to the Web. They are similar to Visual Basic-based Windows forms. They support traditional ASP syntax but enable separation of application code from user interface content. Web Forms support graphical controls that encapsulate common user interface elements, such as buttons and text boxes. These controls generate the user interface typically in the form of HTML. A graphical WYSIWYG development environment can hence be used for designing the layout of Web pages. ASP+ also supports more complex Web controls such as calendars and ad rotators. These controls can detect the type of client and generate appropriate content. Web Forms have to be capable of responding to user interaction. For this, they take advantage of the ASP+ services, which provide a component-based, event-driven programming model. ASP+ also provides state management and data access services.
The separation of code and content enables ASP+ pages to be dynamically compiled into managed
classes for fast performance. ASP+ also provides thread safety by routing each incoming HTTP
request to a new page instance.
ASP+ Web Services
The ASP+ Web Services programming model can be used for building Web Services with ASP+. It simplifies development and is easy to use for developers who have worked with ASP or Visual Basic. Developers using this programming model do not need to understand HTTP, SOAP, SCL, or any other specifications for Web Services.
ASP+ Web Service files have the extension, .asmx and can be deployed as part of a Web application. They basically contain a definition of the class implementing the service or a reference to the class if it is defined elsewhere. These classes are derived from the ASP+ Web Service class and are managed by the CLR. They expose public class methods as Web Service methods by marking them with the Web Method attribute. The Web Service methods can be invoked by calling the ASMX file using either SOAP or HTT'P protocols. Developers do not have to define contracts for the Web Service as the contract files are automatically generated by ASP+ when reused by the caller. ASP+ Web Services are stateless. They can use the ASP+ State Management services if required. They run in the Web application model and get all the benefits of that model. ASP+ Web Services also enable generation of proxies for Web Services. These proxies hide the networking and marshaling code from the application code, so that the Web Service can be used just like any other managed code. Understanding Unified Programming Classes in Detail To facilitate interoperability between languages, the .NET Framework are CLS-compliant and can be used from any language compiler that targets the Common Language Runtime.
The .NET Framework includes types the encapsulate data structures, perform I/O, give you access to information about a loaded class, and provide a way to invoke .NET Framework security checks, as well as classes that encapsulate exceptions, and other helpful; functionality such as disk access, server controls and rich GUI generation. These types are designed to be the foundation which .NET applications, .components, and controls are built.
The .NET Framework provides both abstract base classes and class implementations derived from
