The data management provided by .Net are as follows:
System.data: contains the basic objects used for accessing and storing relational data, such as
DataSet,DataTable, and DataRelation.
System.Data.OleDB: contains the objects that we use to connect to a data source via an OLE-DB provider,such as OleDbConnection, OleDbCommand, etc.
System.Data.SqlClient: contains the objects that we use to connect to a data source via the Tabular Data Stream (TDS) interface of Microsoft SQL Server (only).
System.XML: contains the basic objects required to create, read, store, write, and manipulate
XML documents according to W3C recommendations.