Some Namespaces and their use

Some Namespaces and their use:
System: Includes essential classes and base classes for commonly used data types, events, exceptions and so on(Base Class of all)

System.XML: Includes classes for XML support

System.Windows.Forms: Includes classes for creating Windows based forms

System.IO: Includes classes for data access with Files(Input and Output Operation)

System.Data.OleDb: Includes classes that support the OLEDB .NET

System.Data.SqlClient: Includes classes that support the SQL Server .NET provider