OleDbConnection.Open Method


Opens a database connection with the property settings specified by the ConnectionString.

 override void Open();
 virtual void Open();
public override void Open ();
public void Open ();
override this.Open : unit -> unit
abstract member Open : unit -> unit
override this.Open : unit -> unit
Public Overrides Sub Open ()
Public Sub Open ()



The connection is already open.

A connection-level error occurred while opening the connection.


The OleDbConnection draws an open connection from the connection pool if one is available. Otherwise, it establishes a new connection to the data source. You can open more than one DataReader on a single OleDbConnection. If the OLEDB provider you use does not support more than one active DataReader on a single connection, the OLEDB provider implicitly opens an additional connection for each.


If the OleDbConnection goes out of scope, it is not closed. Therefore, you must explicitly close the connection by calling Close or Dispose, or using the connection within a Using statement.

Applies to

See also