Allowing to abort is disabled per default since thread aborting results in unstable system state, see http://msdn.microsoft.com/en-us/magazine/cc163644.aspx : [..] "I'll caution you against using Thread.Abort to control the lifetime of a thread, especially if you have little knowledge about the implementation of the code you're aborting. An abort inside of a critical region could spell disaster for an entire AppDomain, and while a polite abort does signficantly reduce the window of disaster to very tiny slivers, that one time out of 1,000 could lead to a deadlock or resource leak or worse."

public BasicWorkItem(
	bool allowAbortUponExceedingTimeLimit
)

Public Sub New ( _
	allowAbortUponExceedingTimeLimit As Boolean _
)

public:
BasicWorkItem(
	bool allowAbortUponExceedingTimeLimit
)