IScheduler Start Method Quartz.NET API Documentation
Starts the IScheduler's threads that fire ITriggers. When a scheduler is first created it is in "stand-by" mode, and will not fire triggers. The scheduler can also be put into stand-by mode by calling the Standby  method.

Namespace: Quartz
Assembly: Quartz (in Quartz.dll) Version: 2.2.1.400
Syntax
Remarks
The misfire/recovery process will be started, if it is the initial call to this method on this scheduler instance.
See Also
IScheduler Interface
IScheduler Members
Quartz Namespace
IScheduler StartDelayed(TimeSpan)
IScheduler Standby 
IScheduler Shutdown(Boolean)