NameSpaces using in DotNet

Namespaces

            A namespace is a collection of different classes. All VB applications are developed using classes from the .NET System namespace. The namespace with all the built-in VB functionality is the System namespace. All other namespaces are based on this System namespace.

Some Namespaces and their use:

System: Includes essential classes and base classes for commonly used data types, events, exceptions and so on.
System.Collections: Includes classes and interfaces that define various collection of objects such as list, queues, hash tables, arrays, etc.
System.Data: Includes classes which lets us handle data from data sources.
System.Data.OleDb: Includes classes that support the OLEDB .NET provider.
System.Data.SqlClient: Includes classes that support the SQL Server .NET provider.
System.Diagnostics: Includes classes that allow to debug our application and to step through our code.
System.Drawing: Provides access to drawing methods.
System.Globalization: Includes classes that specify culture-related information.
System.IO: Includes classes for data access with Files.

System.Net: Provides interface to protocols used on the internet.
System.Reflection: Includes classes and interfaces that return information about types, methods and fields.
System.Security: Includes classes to support the structure of common language runtime security system.
System.Threading: Includes classes and interfaces to support multithreaded applications.
System.Web: Includes classes and interfaces that support browser-server communication.
System.Web.Services: Includes classes that let us build and use Web Services.
System.Windows.Forms: Includes classes for creating Windows based forms.
System.XML: Includes classes for XML support.