events and backgroundworker thread

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Hi ...
I have lets say 4 backgroundworker thread running
they all connect to sqlserver2005 does some processing

where im having problems..its on critical errors
lets say the sqlserver is down..

so tons of errors are kicked off , where as i catch them
at different places in the code, try/catch blocks

what i want to do is stop the threads (not destroy)
and tell the service to stop

any advice on how to accomplish this.....
I did create a eventhandler but seems im still stuck in several stacks for
the threads when this event is fired

thanks




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