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  • In case of Join, the thread calling the Join method will wait for it to return. In case of Thread.IsAlive, you will have to poll some specified number of time (like 1 second). It would be the same as calling Join method, the calling thread will have to wait until all threads terminate. So better use Thread.Join() Commented Mar 8, 2010 at 9:48
  • The key difference is that polling IsAlive() allows your main thread to continue doing other work, if there is any. Good points though - if there's no work to be done, Join() is the more efficient choice. Commented Mar 9, 2010 at 7:19