Check if task is already running before starting new

Question

There is a process which is executed in a task. I do not want more than one of these to execute simultaneously.

Is this the correct way to check to see if a task is

Answer 1

As suggested by Jon Skeet, the Task.IsCompleted is the better option.

According to MSDN:

IsCompleted will return true when the task is in one of the three final states: RanToCompletion, Faulted, or Canceled.

But it appears to return true in the TaskStatus.WaitingForActivation state too.