If the registered progress handler returns non-zero, the operation is interrupted.
The handler must not do anything that will modify the connection it is registered in. This includes SQL statement preparation and execution, retrieving data, etc.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2