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If it has to run only once a day, you don't need a Windows Service because that is not what it was made for  . Instead, create a console application that does your work and use Task Scheduler to run your app at 12:00 AM.
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Sorry I voted your answer with 1, cause you are the 3th one who said to use the task planer and he also said it has to be a service!
Greetings
Covean
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May be the OP does not know what he/she wants. That is why I suggested console app + Task schduler will be a better candidate than a Windows Service. Windows Service is NOT designed to act like a task scheduler.
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But you were the third one who said exactly the same! And this even after the OP said it has to be a service!
Greetings
Covean
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The Windows Task Scheduler is a service. Maybe the OP doesn't know that.
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Maybe the OP has known that the Windows Task Scheduler is a service but its simply not available (cause as a result of some security issue they disabled the task planer) on the machine he has to do his maintenance or something else.
Greetings
Covean
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So, from when have you started mind-reading? As technology specialists, our job is not just to give answers, but the best answers, and that is what I am trying to do here. The OP did not mention anywhere that Task Scheduler cannot be used. What I gave is a general idea.
I would suggest that you try to help OP on your own rather than concentrating on others' answers and rating them down (insanely and for imaginary reasons).
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Hi Calla,
Thanks for response.
It has to be a win service that automatically runs at that time and not throug windows
Was the first and only answer from the OP! Read and understand it!
After this and 2 other poster, whose said to use the task planer, you answered exactly the same,
thats the point! Thats why I down voted you. I never had answered to this thread if he hadn't answered
this way! I only offered an alternative like I implemented it in a service years ago (but this service has to do more then just start some scheduled task).
So at last: I never said your answer is wrong, but 3 times the same sh... after the OP queried for some alternatives.
Greetings
Covean
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Covean wrote: It has to be a win service that automatically runs at that time and not throug windows
If you want something that runs automatically at a particular time, then a windows service is probably not the answer because that's not what windows services are for. That's what the Task Scheduler is for. I think the fact that several people have made similar suggestions is an indication that there is a modicum of consensus on the issue. There is nothing in the forum rules that I'm aware of that prevents two people from offering the same advice in response to a question.
And what does it mean to have a Windows service that runs "not through Windows". That seems a trifle confused to me to say the least.
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It seems this guy is on a "thumbs down spree" He seems to be more confused than the OP itself.
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Please read my post before once again, and now find out
who wrote "It has to be a win service that automatically runs at that time and not throug windows".
To the task planer issue. I never said its the wrong way, and yes its also the best way in general case.
But please read my posting before.
Greetings
Covean
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When the OP said "not through windows", it means not through interactive user logon, and AFAIK Task Scheduler is a service that runs even if no user is logged in.
And when the OP says "it has to be win service", it may be based on wrong assumptions.
IMO, you can vote an answer down only when it is wrong or out-of-context or is misleading. Offering alternative ideas is no sin and does not deserve a thumbs down (even if it is, it should be ONLY the OP who should do this).
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Shameel wrote: you can vote an answer down only when it is wrong or out-of-context or is misleading
No, this is a democracy, anyone can vote any way they please.
Shameel wrote: Offering alternative ideas is no sin
Indeed; in fact not offering alternative ideas when they apply could be considered a sin of omission. 
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PIEBALDconsult wrote: No, this is a democracy, anyone can vote any way they please.
Why should someone vote down a good answer? Even if someone does, a new comer might think that it is a bad answer based on the rating, and that is one of the purposes why rating systems exist.
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Shameel wrote: Why should someone vote down a good answer?
Alas, there are feuds and rivalries and pettiness. 
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PIEBALDconsult wrote: Alas, there are feuds and rivalries and pettiness.
Yes, unfortunately there are. But ideally, they should have no place in a technical forum like this.
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Covean wrote: So at last: I never said your answer is wrong, but 3 times the same sh... after the OP queried for some alternatives.
It might be sh** to you, not to the OP. This is what the OP wrote sometime ago to another post in this thread.
"Dear all,
Thanks a lot for usefull responses.
Im very new in this and i thought that a windows service is the solution for my project.
My application had to import some data from network once a day, save it to our db and export it to some other relations.
Bud i will discuse your suggestions with my coworkers.
Thanks a lot."
It means the OP is ready to explore the idea of using task sheduler.
And do you seriously believe that Windows Service exists to do this kind of work ?
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I want to apologize myself for voting you down.
... every following word is just destructive ...
Greetings
Covean
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So, you now atleast agree that you tried to push her out of the window when most of others tried to show her the elevator 
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Covean wrote: the OP said it has to be a service
But we were able to read between the lines and determine that that is not actually what the OP needed and therefore we were able to suggest a better solution than that which was asked for in the post. This happens quite a bit here; less-experienced developers may not know all the tools available to them. By recommending better techniques the developer's skillset is broadened, and that's a good thing.
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We are here to help other developers become the best they can be. In many cases, what the poster thinks he wants to do is not the best course of action. Using the Task Scheduler is the better technique based on what was in the post. The poster gave no reasons for the requirement of being a Service or why it could not be a Task. I, for one, therefore assume that he does not know about the Task Scheduler and why it is (probably) a better solution for his needs. If he has at least considered using a Task, but still insists on a Service, then so be it. I, myself, have written a task scheduler as a Service -- but it didn't execute only one task once a day, it executed many at various times, and I eventually stopped using it.
If a person wanted to jump off a tall building just to get to the ground I wouldn't push him; I'd recommend the elevator instead.
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Sorry have you ever read my post and all postings before?
In one answer he said it has to be a service long time before the poster of this subthread ever answered.
Next point: There were 2 other persons who told before that he should use the task planer, so why the hell should someone answer the question a third time with an answer the OP can't use???
Thats exactly the reason why I voted with 1.
At least one point to think about: What are the differences between a service and an application
started by the task planer (what itself is a service!)?!
Greetings
Covean
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What is the problem with it.
Just use
Thread.Sleep , to sleep the current thread for a time which wakes up only at 12:00 AM. Calculate the time seed needed from current time to this time, and sleep for that. Now reset the seed for 24 hrs and apply thread.sleep again (infinitely)
If the process restarts again, it will do the calculation to find the sleep value.
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Only use Thread.Sleep will not solve the problem because this thread doesn't react on service requests and at least it should react on stop request.
Greetings
Covean
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<DevilsAdvocate>The OnStart could spawn off a Thread that Sleeps and the OnStop could Abort that Thread.</DevilsAdvocate> 
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