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    <p>Please <em>don't</em> use <code>Thread.Abort</code> as recommended by the other answers so far, unless you want your program to be in an unknown state (see articles by <a href="http://www.interact-sw.co.uk/iangblog/2004/11/12/cancellation" rel="nofollow noreferrer">Ian Griffiths</a> and <a href="http://www.ondotnet.com/pub/a/dotnet/2003/02/18/threadabort.html" rel="nofollow noreferrer">Chris Sells</a> for more info). If closing the form should actually be killing the app, you're <em>probably</em> okay - but in that case I'd recommend just using background threads anyway, which will automatically die when all foreground threads have terminated.</p> <p>From Joe Duffy's <a href="http://rads.stackoverflow.com/amzn/click/032143482X" rel="nofollow noreferrer">"Concurrent Programming in Windows"</a>:</p> <blockquote> <p>There are two situations in which thread aborts are always safe:</p> <ul> <li>The main purpose of thread aborts is to tear down threads during CLR AppDomain unloads. [...]</li> <li>Synchronous thread aborts are safe, provided that callers expect an exception to be thrown from the method. [...]</li> </ul> <p>All other uses of thread aborts are questionable at best. [...] While thread aborts are theoretically safer than other thread termination mechanisms, they can still occur at inopportune times, leading to instability and corruption if used without care.</p> </blockquote> <p>(Synchronous thread aborts are when the thread aborts itself, rather than being aborted by another thread.)</p> <p>For <em>graceful</em> shutdown (without risking getting into odd states) use a flag which is set periodically from the form and checked from the other threads - taking the memory model into account (e.g. either making the flag volatile or using a lock each time you test or set it). See my <a href="http://pobox.com/~skeet/csharp/threads/shutdown.shtml" rel="nofollow noreferrer">article on the topic</a> for an example.</p>
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    1. COTo close the form I have the corresponding event. I have named the thread that I wish to terminate as SecondThread. However I am unable to call SecondThread.Is there something I am missing here. Moreover if there is anyway by which a thread can abort itself that would simplify things because i prefer using the concept of flags as you have pointed out.
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    2. COYou just make sure that it has access to a shared piece of data, and that it polls it regularly to see whether or not it should shut down. Of course, you can only do this if you control what the thread's doing yourself.
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      1. USJon Skeet
    3. COThis is quite subjective - if your threads are for a single unit of work then calling Thread.Abort() shouldn't leave it in a dirty state (provided you handle the abort properly). If you have a thread which is then calling out to lot of other methods then it gets messier. Its really a case of looking at what you are doing and determining the best approach.
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      1. USMatthew Savage
 

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