System— Contains all the base data types and other useful classes such as those related to generating random numbers and working with dates and times.
System.Collections— Contains classes for working with standard collection types such as hash tables, and array lists.
System.Collections.Specialized— Contains classes that represent specialized collections such as linked lists and string collections.
System.Configuration— Contains classes for working with configuration files (Web.config files).
System.Text— Contains classes for encoding, decoding, and manipulating the contents of strings.
System.Text.RegularExpressions— Contains classes for performing regular expression match and replace operations.
System.Web— Contains the basic classes for working with the World Wide Web, including classes for representing browser requests and server responses.
System.Web.Caching— Contains classes used for caching the content of pages and classes for performing custom caching operations.
System.Web.Security— Contains classes for implementing authentication and authorization such as Forms and Passport authentication.
System.Web.SessionState— Contains classes for implementing session state.
System.Web.UI— Contains the basic classes used in building the user interface of ASP.NET pages.
System.Web.UI.HTMLControls— Contains the classes for the HTML controls.
System.Web.UI.WebControls— Contains the classes for the Web controls.
.NET Framework-Compatible Languages
For purposes of this book, you will write the application logic for your ASP.NET pages using Visual Basic as your programming language. It is the default language for ASP.NET pages. Although you stick to Visual Basic in this book, you also need to understand that you can create ASP.NET pages by using any language that supports the .NET Common Language Runtime. Out of the box, this includes C#, JScript.NET, and the Managed Extensions to C++.
NOTE
The CD included with this book contains C# versions of all the code samples.
Dozens of other languages created by companies other than Microsoft have been developed to work with the .NET framework. Some examples of these other languages include Python, SmallTalk, Eiffel, and COBOL. This means that you could, if you really wanted to, write ASP.NET pages using COBOL.
Regardless of the language that you use to develop your ASP.NET pages, you need to understand that ASP.NET pages are compiled before they are executed. This means that ASP.NET pages can execute very quickly.
The first time you request an ASP.NET page, the page is compiled into a .NET class, and the resulting class file is saved beneath a special directory on your server named Temporary ASP.NET Files. For each and every ASP.NET page, a corresponding class file appears in the Temporary ASP.NET Files directory. Whenever you request the same ASP.NET page in the future, the corresponding class file is executed.
When an ASP.NET page is compiled, it is not compiled directly into machine code. Instead, it is compiled into an intermediate-level language called Microsoft Intermediate Language (MSIL). All .NET-compatible languages are compiled into this intermediate language.本文来自优.文,论-文'网原文请找腾讯752018766
An ASP.NET page isn't compiled into native machine code until it is actually requested by a browser. At that point, the class file contained in the Temporary ASP.NET Files directory is compiled with the .NET framework Just in Time (JIT) compiler and executed.
The magical aspect of this whole process is that it happens automatically in the background. All you have to do is create a text file with the source code for your ASP.NET page, and the .NET framework handles all the hard work of converting it into compiled code for you.
ASP CLASSIC NOTE
What about VBScript? Before ASP.NET, VBScript was the most popular language for developing Active Server Pages.
ASP.NET does not support VBScript, and this is good news. Visual Basic is a superset of VBScript, which means that Visual Basic has all the functionality of VBScript and more. So, you have a richer set of functions and statements with Visual Basic.
Furthermore, unlike VBScript, Visual Basic is a compiled language. This means that if you use Visual Basic to rewrite the same code that you wrote with VBScript, you can get better performance.
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