Commands and parameters
Applies to: 
.NET Framework
.NET
.NET Standard
After establishing a connection to a data source, you can execute commands and return results from the data source using a DbCommand object. You can create a command using one of the command constructors for the Microsoft SqlClient Data Provider for SQL Server. Constructors can take optional arguments, such as a SQL statement to execute at the data source, a DbConnection object, or a DbTransaction object.
You can also configure those objects as properties of the command. You can also create a command for a particular connection using the CreateCommand method of a DbConnection object. The SQL statement being executed by the command can be configured using the CommandText property. The Microsoft SqlClient Data Provider for SQL Server has the SqlCommand object.
In this section
Executing a Command
Describes the ADO.NET Command object and how to use it to execute queries and commands against a data source.
Configuring parameters
Describes working with Command parameters, including direction, data types, and parameter syntax.
Generating commands with CommandBuilders
Describes how to use command builders to automatically generate INSERT, UPDATE, and DELETE commands for a DataAdapter that has a single-table SELECT command.
Obtaining a single value from a database
Describes how to use the ExecuteScalar method of a Command object to return a single value from a database query.
Using commands to modify data
Describes how to use the Microsoft SqlClient data provider for SQL Server to execute stored procedures or data definition language (DDL) statements.