Creates a prepared (or compiled) version of the command on the data source.
If the CommandType property is set to TableDirect, Prepare does nothing. If CommandType is set to StoredProcedure, the call to Prepare should succeed, although it may result in a no-op.
The following example creates an instance of the derived class, OleDbCommand, and opens the connection. The example then prepares a stored procedure on the data source by passing a string that is a SQL Select statement and a string to use to connect to the data source.
int id = 20;
string desc = "myFirstRegion" ;
OleDbConnection rConn = new OleDbConnection("Provider=SQLOLEDB;Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;");
OleDbCommand command = new OleDbCommand(null, rConn);
// Create and prepare an SQL statement.
command.CommandText = "insert into Region (RegionID, RegionDescription) values (@id, @desc)" ;
command.Parameters.Add ( "@id", id) ;
command.Parameters.Add ( "@desc", desc) ;
command.Prepare() ; // Calling Prepare after having set the Commandtext and parameters.
// Change parameter values and call ExecuteNonQuery.
command.Parameters.Value = 21;
command.Parameters.Value = "mySecondRegion";