Executes an SQL statement against the Connection and returns the number of rows affected.
Assembly: System.Data (in System.Data.dll)
The connection does not exist.
The connection is not open.
Cannot execute a command within a transaction context that differs from the context in which the connection was originally enlisted.
You can use the to perform catalog operations, for example, to query the structure of a database or to create database objects such as tables, or to change the data in a database without using a DataSet by executing UPDATE, INSERT, or DELETE statements.
Although the returns no rows, any output parameters or return values mapped to parameters are populated with data.
For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. For all other types of statements, the return value is -1. If a rollback occurs, the return value is also -1.
The following example creates an OleDbCommand and then executes it using . The example is passed a string that is an SQL statement such as UPDATE, INSERT, or DELETE, and a string to use to connect to the data source.