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.NET Namespace

Meaning in Life

System

Within System, you find numerous useful types dealing with

intrinsic data, mathematical computations, random number

generation, environment variables, and garbage collection,

as well as a number of commonly used exceptions and

attributes.

System.Collections

These namespaces define a number of stock container types,

System.Collections.Generic

as well as base types and interfaces that allow you to build

customized collections.

System.Data

These namespaces are used for interacting with relational 

System.Data.Odbc

databases using ADO.NET.

System.Data.OracleClient

System.Data.OleDb

System.Data.SqlClient

System.IO

These namespaces define numerous types used to work with 

System.IO.Compression

file I/O, compression of data, and port manipulation.

System.IO.Ports

System.Reflection

These namespaces define types that support runtime type 

System.Reflection.Emit

discovery as well as dynamic creation of types.

System.Runtime.InteropServices

This namespace provides facilities to allow .NET types to

interact with “unmanaged code” (e.g., C-based DLLs and

COM servers) and vice versa.

System.Drawing

These namespaces define types used to build desktop 

System.Windows.Forms

applications using .NET’s original UI toolkit (Windows

Forms).

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