ConstraintException Represents the exception that is thrown when attempting an action that violates a constraint.

 DataException Represents the exception that is thrown when errors are generated using ADO.NET components.

 StateChangeEventArgs Provides data for the state change event of a .NET Framework data provider.

 CommandBehavior Provides a description of the results of the query and its effect on the database.

 CommandType Specifies how a command string is interpreted.

 ConnectionState Describes the current state of the connection to a data source.

 DbType Specifies the data type of a field, a property, or a Parameter object of a .NET Framework data provider.

 IsolationLevel Specifies the transaction locking behavior for the connection.

 ParameterDirection Specifies the type of a parameter within a query relative to the DataSet.

 UpdateRowSource Specifies how query command results are applied to the row being updated.