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I propose to write a C# program to get the content of a xml file. However, that file may be modified after 10 seconds, 10 minutes or 10 hours. I think the algorithm of getting the content every 10 seconds to check whether it was chaged is too stupid, assuming there are 50,000 users running the program(cause a heavy workload for the web server, worse still it is unable to handle). Certainly, less than 10-second delay is acceptable if real-time is impossible. Please advise me a better algorithm. Any idea would be appreciated.

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algorithm to get xml update