Thread Priority can be changed by using Threadname.Priority = ThreadPriority.Highest.In the sample provided look out for code where the second thread is ran with a high priority.
Following are different levels of Priority provided by .NET :-
1- ThreadPriority.Highest
2-ThreadPriority.AboveNormal
3 -ThreadPriority.Normal
4- ThreadPriority.BelowNormal
5- ThreadPriority.Lowest