Backgroundworker progresschanged not updating sedating dogs nail clipping
Only use the Progress Changed and Run Worker Completed event handlers to alter your UI controls within the context of the background worker.
If you do not heed this warning you will get an Invalid Operation Exception stating: Something noteworthy about the Do Work event handler is that it eats up exceptions and spits them out in the Run Worker Completed event handler by placing them inside the Error property of the Run Worker Completed Event Args object.
Soon after the Run Worker Async method is called, the Do Work event is raised which begins execution of the background operation.
Here we loop through each positive integer in the specified range and test it for primality.
If you recall, in the Do Work event handler we check the Cancellation Pending property of the background worker at the start of each iteration of the for loop.