IScheduler PauseAll Method Quartz.NET API Documentation
Pause all triggers - similar to calling PauseTriggers(GroupMatcher TriggerKey ) on every group, however, after using this method ResumeAll  must be called to clear the scheduler's state of 'remembering' that all new triggers will be paused as they are added.

Namespace: Quartz
Assembly: Quartz (in Quartz.dll) Version: 2.2.1.400
Syntax
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void PauseAll()
Remarks
When ResumeAll  is called (to un-pause), trigger misfire instructions WILL be applied.
See Also
IScheduler Interface
IScheduler Members
Quartz Namespace
IScheduler ResumeAll 
IScheduler PauseTriggers(GroupMatcher TriggerKey )
IScheduler Standby