Data Management Namespaces

System.Data	Classes that constitute the ADO.NET relational data access and management architecture for multiple data sources.
System.Data.Common	Classes that form the basis for the provider specific classes such as DataReader, Connection, DataAdapter, etc. within the subsidiary namespaces.
System.Data.Odbc	Classes that support the ODBC .NET data provider.
System.Data. OracleClient	Classes that support the Oracle .NET data provider.
System.Data. SqlServerCe	Classes that support the SQL Server on WIndows Compact Edition.
System.Data.OleDb	Classes that support the OLE DB .NET data provider.
System.Data. SqlClient	Classes that support the SQL Server .NET data provider.
System.Data. SqlTypes	Classes for native data types within MS SQL Server.
System.Xml	Classes that provide standards-based support for processing XML.
System.Xml.Schema	Classes that provide standards-based support for processing XML schemas.
System.Xml. Serialization	Classes that can be used to serialize and deserialize objects as XML.
System.Xml.XPath	Contains the XPath parser and evaluation engine.
System.Xml.Xsl	Classes that provide support for XSL/T transformations.