1.SqlClientPermission - Enables the .NET Framework Data Provider
for SQL Server to help ensure that a user has a security level adequate to access a data source. 2.SqlClientPermissionAttribute - Associates a security action
with a custom security attribute. 3. SqlCommand - Represents a Transact-SQL statement
or stored procedure to execute against a SQL Server database. This class cannot be inherited. 4.SqlCommandBuilder - Automatically generates
single-table commands used to reconcile changes made to a DataSet with the associated SQL Server database. This class cannot be inherited. 5. SqlConnection - Represents an open connection
to a SQL Server database. This class cannot be inherited. 6.SqlDataAdapter - Represents a
set of data commands and a database connection that are used to fill the DataSet and update a SQL Server database. This class cannot be inherited. 7.SqlDataReader - Provides a means of reading a forward-only stream of rows from a SQL Server database. This
class cannot be inherited. 8.SqlError - Collects information relevant
to a warning or error returned by SQL Server. This class cannot be inherited. 9.SqlErrorCollection - Collects all errors generated by the .NET Framework Data Provider
for SQL Server. This class cannot be inherited. 10.SqlException - The exception that
is thrown when SQL Server returns a warning or error. This class cannot be inherited. 11.SqlInfoMessageEventArgs - Provides data
for the InfoMessage event. This class cannot be inherited. 12.SqlParameter - Represents a parameter
to a SqlCommand and optionally its mapping to DataSet columns. This class cannot be inherited. 13.SqlParameterCollection - Represents a collection of parameters relevant
to a SqlCommand as well as their respective mappings to columns in a DataSet. This class cannot be inherited. 14.SqlRowUpdatedEventArgs - Provides data
for the RowUpdated event. This class cannot be inherited. 15.SqlRowUpdatingEventArgs- Provides data
for the RowUpdating event. This class cannot be inherited. 16. SqlTransaction - Represents a Transact-SQL transaction
to be made in a SQL Server database. This class cannot be inherited. 
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