Which namespaces are used for data access?

Using system.data

The data and XML namespaces in the .NET for data access. 1. System.Data 2. System.Data.Common 3. System.Xml 4. System.Data.OleDb 5. System.Data.SqlClient 6. System.Data.Sql 7. System.Data.SqlTypes 8. Microsoft.SqlServer.Server 9. System.Data.Odbc 10. System.Data.OracleClient 11. System.Transactions

using System.Data; using System.Data.SqlClient if Connection with SqlServer or using System.Data.Oledb if connection with Access

using system.data using system.configuration

hello friend, using System.Data