. NET namespaces

System: Root space, containing some basic class libraries
System.Collections: Primarily the class libraries associated with collection classes
System.Collections.Generic: Class-Library space for generic collections
System.Data: Data processing class library space
SYSTEM.DATA.ODBC: space to connect to the database with ODBC
System.Data.OracleClient: Connecting Oracle's class library space
System.Diagnostics: Primarily for application diagnostics
System.Drawing: The space that is mainly used for spitting back
System.Drawing.Drawing2D: A class library focused on 2D drawings
System.Drawing.Printing: A class library primarily for drawing printing
System.Environment: Get heartache Parameter information class Library
System.IO: Input Output Class Library
System.IO.Compression: is responsible for the input and output compression decompression class Library
System.IO.Ports: Port-related class libraries
System.Net: Network Application class Library
System.Reflection: Reflection-related class libraries
System.Runtime.InteropServices: Runtime mutual invoke class library space
System.Runtime.Remoting: Remote invocation of class library space
System.Security: Security-related class library space
System.Threading: Thread-related class library space
System.Web:Web Related class library space
Syetem.Windows.Forms: Form-related class library space
System.Xml:XML file processing-related class library space