Here are the commonly used classes in System.Data.SqlClient:
SqlCommand:
Represents a Transact-SQL statement or stored procedure to execute against a SQL Server database.
SqlCommandBuilder:
Automatically generates single-table commands used to reconcile changes made to a DataSet with the associated SQL Server database.
SqlConnection:
Represents an open connection to a SQL Server database.
SqlDataAdapter:
Represents a set of data commands and a database connection that are used to fill the DataSet and update a SQL Server database.
SqlDataReader:
Provides a means of reading a forward-only stream of rows from a SQL Server database.
SqlTransaction:
Represents a Transact-SQL transaction to be made in a SQL Server database.
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