Firebird ADO.NET Provider SDK Documentation - v1.7

FbConnection.Close Method 

Closes the connection to the database. This is the preferred method of closing any open connection.

[Visual Basic]
NotOverridable Public Sub Close() _
    Implements IDbConnection.Close
[C#]
public void Close();

Implements

IDbConnection.Close

Remarks

The Close method rolls back any pending transactions and drops active statments. It then releases the connection to the connection pool, or closes the connection if connection pooling is disabled. If Close is called while handling a StateChange event, no additional StateChange events are fired.

Close can be called more than one time without generating an exception.

See Also

FbConnection Class | FirebirdSql.Data.Firebird Namespace