A System.Threading.ThreadPriority value.
Type Reason System.Threading.ThreadStateException The thread is in the ThreadState.Stopped state. ArgumentException The value specified for a set operation is not a valid System.Threading.ThreadPriority value.
A thread can be assigned any one of the following priority values:
Highest
AboveNormal
Normal
BelowNormal
Lowest
Operating systems are not required to honor the priority of a thread.