All Parameter
objects implement the
IDbDataParameter and
IDataParameter interfaces from the
System.Data namespace, and are thus quite similar.
Because IDbDataParameter extends
IDataParameter, you can use the
IDataParameter to access all functionality when
writing provider-agnostic data access code.
Provider-specific Parameter objects typically add
a property that defines a database-specific data type for the
parameter. Some Parameter classes for ADO.NET
providers are shown in Table 20-1.