Tuesday, April 10, 2012


ASP.NET is a programming framework developed
by Microsoft for building powerful Web

Web Servers
The previous version of Active Server Pages was ASP
3.0. ASP.NET and ASP 3.0 can both run on Internet
Information Server (IIS) 5.0 with Windows 2000 and
Windows XP. You can have your ASP.NET and your ASP
3.0 applications run on the same server.
If you use Windows 95, 98, ME, or NT, and you want to
run ASP.NET applications, you can install Windows NT or
XP in addition to your other operating system by creating
a dual-boot machine. This will enable you to run two
operating systems on one machine, giving you the ability
to run ASP.NET and keeping your original operating
system intact. You will have to devote around 5GB of
disk space to install the operating system (OS), the .NET
Framework SDK, and any other supporting applications,
such as SQL Server 2000. To separate the files associated
for each OS, you should create a separate partition for
the new OS.

The ASP.NET Framework is supported on Windows 2000
and Windows XP. ASP.NET applications will run on IIS
5.0 for these operating systems.
Web Services is supported on all platforms supported
by the Microsoft .NET Framework SDK, except
Windows 95.
Windows XP, Windows 2000, Windows NT 4 with
Service Pack 6a, Windows ME, Windows 98, Windows
98 SE, and Windows 95 all support the Microsoft .NET
Framework SDK.

Language Support
ASP.NET has built-in support for three languages: Visual
Basic (VB), C#, and JScript. You can install support for
other .NET-compatible languages as well.

Microsoft designed ASP.NET to work with WYSIWYG
HTML editors and other programming tools. Or, you can
even use a simple text editor like Notepad. The Notepad
text editor is used in this book’s code samples. If you want
more support from your development environment for
coding, you can use Microsoft Visual Studio.NET. Using a
tool such as Microsoft Visual Studio.NET enables you to
take advantage of other features such as GUI support of
drag and drop Server Controls and debugging support.

Web Forms
ASP.NET Web Forms gives you the ability to create Web
pages on the .NET platform. Web Forms enable you to
program against the controls that you put on your Web
pages. You can either use a Server Control that is built
into ASP.NET or create your own custom Server
Controls. These Server Controls are used for
controlling HTML tags on a Web page. By using Web
Forms, you can build user interface code as effectively
as your Business Services code, reusing and packaging
the code in a well-designed manner.

Web Services
ASP.NET Web Services gives you the ability to access
server functionality remotely. Using Web Services,
businesses can expose their data and/or component
libraries, which in turn can be obtained and
manipulated by client and server applications.Web
Services enable the exchange of data in client-server or
server-server scenarios, using standards like HTTP and
XML messaging to move data across firewalls.Web
services are not tied to a particular component
technology or object-calling convention. As a result,
programs written in any language, using any component
model, and running on any operating system can access
Web services.

State and Application
ASP.NET provides a simple framework that enables Web
developers to write logic that runs at the application
level. Developers can write this code in either the
global.asax text file or in a compiled class. This logic can
include application-level events, but developers can
easily extend this framework to suit the needs of their
Web application. ASP application code, written in the
global.asa file, is supported in ASP.NET. You can simply
rename global.asa to global.asax when upgrading
from ASP.

Data Access

Accessing databases from ASP.NET applications is a
common technique for displaying dynamic information
to Web site visitors. ASP.NET makes it easier than ever
to access databases for this purpose and provides for
managing the data in the database.

A big difference between ASP 3.0 and ASP.NET is how
your code is run on the server. With ASP.NET, your code
is compiled into executable classes. With ASP 3.0, code
often needs to be interpreted. With ASP 3.0, any serverside
code is most likely going to have to be interpreted
by the Web server, unless it is cached. If you want to
avoid interpreted code in ASP 3.0, you need to put the
code into a COM component.

With ASP.NET, you now have access to the common
language runtime (or CLR). Running on the CLR gives
access to many of the features available in the .NET
Framework, such as debugging, security, data access,
language interoperability, and more.

ASP.NET configuration settings are stored in XML-based
files, which are text files easily accessible for reading
and writing. Each of your applications can have a
distinct configuration file. You can extend the
configuration scheme to suit your requirements.

The .NET Framework and ASP.NET provide default
authorization and authentication schemes for Web
applications. You can easily remove, add to, or replace
these schemes depending upon the needs of your

Migration from ASP to ASP.NET
Simple ASP pages can easily be migrated to ASP.NET
applications. ASP.NET offers complete syntax and
processing compatibility with ASP applications.
Developers simply need to change file extensions from
.asp to .aspx to migrate their files to the ASP.NET
framework. They can also easily add ASP.NET
functionality to their applications with ease, sometimes
by simply adding just a few lines of code to their ASP

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