Find all Tasks I've spawned using Task.Factory.StartNew

In C# (.NET 4.0), I am kicking off a continuous stream of Task instances to asynchronously complete pieces of work, using the Task.Factory.StartNew() method.  In general I don't need to keep track of them or wait for them to complete, since they will finish by themselves.  

I am running this code in a Windows Service.  If an administrator needs to shut down the service, I want to do a graceful shutdown. Is there a way to catch the stop request, and then to find all the Tasks that I've launched that are still executing, so I can wait for them to complete with a Task.WaitAll()?  Some kind of Task.FindBy??? or Task.FindAll method?  
jblindbergAsked:
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arif_eqbalConnect With a Mentor Commented:
I don't think there's a FindAll if you are looking for it, You would need to maintain your own list of Task classes the Task class has a method WaitAll that takes an array of tasks as argument to wait upon, so if you maintain your own list you can just call this function and pass the list items as argument.

If some of your tasks would be long enough and you would want to cancel them rather than wait on them there's a different pattern look for CancellationTokenSource refer http://www.albahari.com/threading/part5.aspx#_Canceling_Tasks

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rafaelrglCommented:
arif_eqbal, can you check my question about the waitall tasks
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