What are shared classes

[Janyasree]

hi Everyone
can any one give answer to this question
What are shared classes?
thank u

[caradoc]

Shared classes refer to the number of classes that are used regardless of whether you are using the SQL Server classes or the OLE DB classes. Some of the classes namely DataSet, DataTable, DataRow, DataColumn, DataRelation and Constraint are present in System.Data namespace. In addition to the above shared classes there is also number of database-specific classes.