Troubleshooting Exceptions: System.Threading.SynchronizationLockException
The exception that is thrown when a method requires the caller to own the lock on a given Monitor, and the method is invoked by a caller that does not own that lock.
Remarks
A SynchronizationLockException is thrown by calling the Exit, Pulse, PulseAll, and Wait methods of the Monitor class from an unsynchronized block of code.
See Also
Tasks
How to: Find Out More About an Exception with the Exception Assistant