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NAMESPACE

NAMESPACE. Namespaces. Namespaces are a way to define the classes and other types of information into one hierarchical structure. System is the basic namespace used by every .NET code.

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NAMESPACE

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  1. NAMESPACE

  2. Namespaces • Namespaces are a way to define the classes and other types of information into one hierarchical structure. • System is the basic namespace used by every .NET code. • If we can explore the System namespace little bit, we can see it has lot of namespace that uses the system namespace. • For example, System.IO, System.Net, System.Collections, System.Threading, etc. • A namespace can be created via the Namespace keyword.

  3. The Namespace Hierarchy and Fully-Qualified Names • For example, the Button type is contained in the System.Windows.Forms namespace.

  4. Namespace Namespace1     Public Class Class1            'class code     End Class End Namespace

  5. Imports alias directives. • A Imports-alias-directive introduces an identifier that serves as an alias for a namespace or type within the immediately enclosing compilation unit or namespace body. Imports identifier = namespace-or-type-name; • Within member declarations in a compilation unit ,the identifier introduced by the Imports-alias-directive can be used to reference the given namespace or type.

  6. 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

  7. 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

  8. 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

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