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If your service takes some time to stop you should inform servicemanager that the service status is stop pending and you need some more time.<br />
<a href="http://msdn2.microsoft.com/en-us/library/d56de412(VS.80).aspx" rel="ugc">http://msdn2.microsoft.com/en-us/library/d56de412(VS.80).aspx</a>
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If your service takes some time to stop you should inform servicemanager that the service status is stop pending and you need some more time.
http://msdn2.microsoft.com/en-us/library/d56de412(VS.80).aspx [http://msdn2.microsoft.com/en-us/library/d56de412(VS.80).aspx]

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I have a Windows Service which processes some files every X seconds. The service should run 24/7 unless there is an exception, in which case I stop the service. However, there are times when I would want to stop the service manually (through Admin Tools/Services). How do I ensure that when I do that while the function that does the file processing is still executing, the service will wait for the function to finish? Is there anything I can put in OnStop() to detect whether the function is running or not? I suppose I could have the function turn some app settings on when it starts executing and off when it finishes executing, and add some code in OnStop() to check the setting. However, I would have to implement a loop to constantly check for the flag, plus I don't know how long OnStop() can wait? <br />
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I would appreciate any suggestions. Thank you.
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I have a Windows Service which processes some files every X seconds. The service should run 24/7 unless there is an exception, in which case I stop the service. However, there are times when I would want to stop the service manually (through Admin Tools/Services). How do I ensure that when I do that while the function that does the file processing is still executing, the service will wait for the function to finish? Is there anything I can put in OnStop() to detect whether the function is running or not? I suppose I could have the function turn some app settings on when it starts executing and off when it finishes executing, and add some code in OnStop() to check the setting. However, I would have to implement a loop to constantly check for the flag, plus I don't know how long OnStop() can wait? 

I would appreciate any suggestions. Thank you.

How to stop a Windows Service gracefully?

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.