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I have done something similar to this using Quartz[^]. Quartz allows you to write your own 'job' class and to add it to its scheduling service with a specific firing time. I poll my DB table for new/changed jobs every few minutes, and submit the jobs to Quartz, which then takes on the precise timing without me having to worry about it. (Quartz is very good for scheduled - i.e. repeating - jobs and it doesn't sound like you want that, but worth a look nonetheless.)
Adam
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I am using Quartz.NET for quite a while and I am very happy.
Especially creating own jobs based on existing interfaces made my life a little bit easier 
...I totally agree that it might be worth a look.
best regards
Andy
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Databases and Regular Files (stream of bytes stored on disk) are both powerful mechanisms for data storage and retrieval. Remember that each has it's strengths: point is to take a moment to think if perhaps the database being polled for work versus a special file you devise (for speed's sake) that allows quick answers to the "Polling: Do what Now? question"
Second - There is a tool called SEC: Simple Event Correlator
I think you'll find this isn't as far removed from what you're trying to do as it might first look... this is the kind of system you are talking about - for general scheduling.. then you can toss in business logic to do all kinds of stuff.
The premise is this thing works by reading log files... and applying "rules" to them./.. basically.. if Log file A says "Server Down" ..say... you toss in rule.. 4 times in an hour - then this SEC thing would see the condition was met, then fire off some other task you said to do in this condition... say email IT server support, call the troops.. Perhaps if the same program see that 2 hours later server is still down - it sends out a email to let folks know "system X" is offline and is undergoing maintenance...
I'm all about writing fresh new cool useful systems when I can manage it.. but in this case.. I think you might have a few systems to pull from that you can "configure-code-customize" to do exactly what you need without to much heads-down new-development other than implementation work to automate what you need done... like sending those emails you were asking about
[edit]Conclusion: By using SEC or Splunk or other log file analyzing rule based engine - and perhaps simply writing a line of text to a log file to cause something to fire... or by just monitoring log files for "triggers" to respond to - action items... might work as a direct alternative to simple scheduled "cron" or "system tasks" being queued up.
[/edit]
Know way too many languages... master of none!
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Thanks for the very detailed response - But I am sticking with a database table for many reasons.
I have already implemented a lot in this service I have created - but very little of it is actually used for the scheduling. Basically all it is is...
- Using one timer
- On start service, Reset timer based on difference between NOW and next scheduled intervral (every 15 minutes of the hour)
- On timer Tick, kick off a sync process to do what needs doing. Then reset the timer
- and on, and on, and.. hopefully on a bit more 
Life goes very fast. Tomorrow, today is already yesterday.
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musefan wrote: next scheduled intervral (every 15 minutes
For that long a duration, I'd consider a Windows Scheduled Task.
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It is configurable so it may change depending on how things go but after getting into the implementation (and how little is actually timer related) I can see your point for just having an application that just runs when scheduler tells it to.
I guess I shall just wait and see how things go, maybe there will be more to this service to come
Life goes very fast. Tomorrow, today is already yesterday.
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musefan wrote: maybe there will be more to this service to come
You can burn that bridge after you've crossed it.
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Dunno if this was suggested to you already, but in my opinion the only way to solve your problem without having to go through some kind of polling is by using triggers.
If your DB server allows you to execute compiled code in triggers you're the winner, since you can then signal your service upon insertion/deletion/update and adjust your schedule timer accordingly.
SQL Server can execute .NET code in triggers (see http://www.15seconds.com/issue/041006.htm[^] for example).
Good luck.
2+2=5 for very large amounts of 2
(always loved that one hehe!)
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Have a look at NServiceBus or Rhino Service Bus. They do exactly what you want.
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I think a dual approach should work.
Use the first job to look only for "unqueued" mails, and move them to a service, which is always on, that way you get the course grained (say next 15 minutes of) work and send the items to the service that can handle the next 900 seconds.... and you can then dynamically set the sleep in the service, to reduce cpu usage, or use the "down time" to see if any new items have been added/ get a leg up on the next cycle... this way if you really want you can ping or reschedual the Job from your service at will. (set it and.. Forget it..  )
I'd blame it on the Brain farts.. But let's be honest, it really is more like a Methane factory between my ears some days then it is anything else...
-----
"The conversations he was having with himself were becoming ominous."-.. On the radio...
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I have had a lingering project with this type of feature. Unfortunately it is always pushed down the priority scale so I haven't implemented a solution.
However, I found are two very potential ways of handling it nicely. They seem to be a lot better than plain old Windows Scheduler or SQL jobs since you can write almost any .Net code you want for it. These are not in any particular order.
1) [Windows Workflow] - This has come a long way and might really work out for you.
2) [Quartz]- Open source enterprise job scheduler. I really want to try out this one. You can can even scale it across multiple servers if you wanted to. Seems pretty robust and has been around for a while. Built on top of .Net so it's definitely something you can probably dive into.
Let us know what you end up using. I'd really like to hear how it turned out.
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from my c# code mail is send to few people but one people getting the same copy twice. i am very confuse about this situation why only one people getting the email of same copy twice when he downloads email from outlook. any idea please......!
thanks
tbhattacharjee
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If you send by group, perhaps this people is in 2 group ?
If other people receive only once the mail, a one people twice. I think it is because this people appear twice in your sending.
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Can you provide some code or tell us how the users register to get added to the distrubtion list? As it stands it coud be one of 100s of things!
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Tridip Bhattacharjee wrote: from my c# code mail is send to few people but one people getting the same copy twice.
you should provide your Code in which problem is occur,
then we can easily manipulate what is problem.
otherwise it is very hard to say what is problem.
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Just what Keith said almost three hours before you. Read the responses already given before adding to the discussion.
I know the language. I've read a book. - _Madmatt
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Are you kidding me, your last question was posted less than 2 hours ago and sounds like you're trying to hack.
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My apologies. Maybe you could try
while (MessageBox.Show("Turn off your monitor now", "Secret Programmers Business", MessageBoxButtons.YesNo) == DialogResult.No) { };
Hope that helps
Seriously though, you can't turn off someones monitor. As a programmer, you need to analyse the problem and suggest a better solution
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Thank you for the answer. I know this is not an elegant solution, but you don't know my boss... Anyway I will manage it somehow... Good job
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Do you honestly think that we are all sitting here 24/7 just waiting for you to ask a question, so that we can rush to answer it?
Get real!
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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I think I was misunderstood ... I was not expecting an immediate response, I just wanted to ask the question differently because I realized that my previous request is not feasible. all.
Perhaps my poor English can create these misunderstandings...sorry again.
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It sounds very like you are trying to hack a system and our help isn't quick enough. It's pretty rude to bump your question like this.
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Can you alter the program you are interacting with?
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