Namespace Definitions in ASP.Net

System- Provides base data types and almost 100 classes that deal with situations like exception handling,
mathematical functions, and garbage collection.

System.CodeDom Provides the classes needed to produce source files in all the .NET languages.

System.Collections Provides access to collection classes such as lists, queues, bit arrays, hash tables, and dictionaries.

System.ComponentModel Provides classes that are used to implement runtime and design-time behaviors of components and controls.

System.Configuration Provides classes and interfaces that allow you to programmatically access the various configuration files that are on your system, such as the web.config and the machine.config files.

System.Data Provides classes that allow data access and manipulation to SQL Server and OleDb data sources.These classes make up the ADO.NET architecture.

System.Diagnostics Provides classes that allow you to debug and trace your application. There are classes to interact with event logs, performance counters, and syste processes.

System.DirectoryServices Provides classes that allow you to access Active Directory.

System.Drawing Provides classes that allow you to access the basic and advanced features of the new GDI+ graphics functionality.

System.EnterpriseServices Provides classes that allow you to access COM+ services.

System.Globalization Provides classes that access the global system variables, such as calendar display, date and time settings, and currency display settings.

System.IO Provides classes that allow access to file and stream control and manipulation.

System.Management Provides access to a collection of management information and events about the system, devices, and applications designed for the Windows Management Instrumentation (WMI) infrastructure.

System.Messaging Provides classes that allow you to access message queue controls and manipulators.

System.Net Provides access to classes that control network services. These classes also allow control over the systems sockets.

System.Reflection Provides classes that allow control to create and invoke loaded types, methods, and fields.

System.Resources Provides classes that allow you to create and manage culture-specific resources.

System.Runtime.Remoting Provides classes that allow the management of remote objects in a distributed environment.

System.Security Provides classes that allow access to authentication, authorization, cryptography, permissions, and policies.

System.ServiceProcess Provides classes that give control over Windows services.

System.Text Provides classes for working with and manipulating text strings.

System.Threading Provides classes for threading issues and allows you to create multithreaded applications.

System.Timers Provides the capability to raise events on specified intervals.

System.Web Provides numerous classes that are used in ASP.NET Web application development.

System.Web.Services Provides classes that are used throughout this book to build, deploy, and consume Web services.

System.Windows.Forms Provides classes to build and deploy Windows Forms ap plications.

System.Xml Provides classes to work with and manipulate XMLdata.