written by KMT on 2005-Oct-29.

The classes contained in a select number of namespaces are available in your ASP.NET pages by default. (You must explicitly import other namespaces.) These default namespaces contain classes that you use most often in your ASp.NET applications:

• 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.Corrections.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 content of strings
  
• System.Text.RegularExpressions
  Contains classes for performing regular expression match and replace operations.
  
• System .Web
  Contains basic classes for working with the World Wide Web, including classes for representing browser requests and server responses.
  
• System.Web.Caching
  Contains classes used or caching 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 HTML controls.
  
• System.Web.UI.WebControls
  Contains the classes for Web controls.

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