Question

I keep hearing DbDataAdapter this days. It is an abstract class of adapter.

But When should i prefer DbDataAdapter over DataAdapter, and what is the difference between DbDataAdapter and DataAdapter(on performance and functionality)?

Answer 1

As you said, DbDataAdapter is an abstract class, that inherits from DataAdapter. As said in MSDN:

Inheritors of DbDataAdapter implement a set of functions to provide
strong typing, but inherit most of the functionality needed to fully
implement a DataAdapter.

And for perfomance, here:

If you are connecting to a SQL Server database, you can increase
overall performance by using the SqlDataAdapter along with its
associated SqlCommand and SqlConnection objects.For OLE DB-supported
data sources, use the DataAdapter with its associated OleDbCommand and
OleDbConnection objects.For ODBC-supported data sources, use the
DataAdapter with its associated OdbcCommand and OdbcConnection
objects.For Oracle databases, use the DataAdapter with its associated
OracleCommand and OracleConnection objects.