ADO.NET Command

The Command Object in ADO.NET plays a crucial role in executing SQL statements and stored procedures against the specified data source, which is typically defined in the Connection Object. To utilize the Command Object effectively, an instance of the Connection Object must be created and a connection to the data source must be established. The open connection is then assigned to the connection property of the Command Object.

Connection Object

To retrieve data or execute an SQL statement against the data source, developers need to follow a sequence of steps. Firstly, a Connection Object is created, and the connection to the data source is opened. Next, this open connection is assigned to the connection property of the Command Object, enabling the execution of SQL statements against the data source.

Command Object

When the Command Object returns a result set, a Data Reader is utilized to retrieve the data from the result set. The Command Object's CommandText property plays a significant role as it contains a string value representing the command to be executed on the data source. For instance, when the CommandType property of the Command Object is set to StoredProcedure, the CommandText property should be set to the name of the stored procedure.

By appropriately configuring the Command Object, developers can execute SQL statements and stored procedures effectively against the data source. The Command Object relies on a valid Connection Object to establish the necessary communication with the data source, and the CommandText property determines the specific command to be executed. By understanding and utilizing these properties, developers can use the capabilities of the Command Object in retrieving and manipulating data from the data source.

Click the following links to see some important built in methods uses in the Command Object to execute the SQL statements.

ExecuteNonQuery

ExecuteReader

ExecuteScalar