There is a lot of discussion in that discussion but I think it won't help 
you. I did not read all of it but all the sample code in that discussion 
seems to be using ASP from the system that the file is in.


"Elliot" <elliot_barclay@h...> wrote in message 
news:BE0EC094-14B4-4609-917A-096725974745@m......
>I will access the xml file on the Internet.
> I found one but have not tried yet. How do you feel the idea from otaku?
> http://www.dynamicdrive.com/forums/archive/index.php/t-9510.html
>
>
> "Sam Hobbs" <samuel@s...> wrote in message 
> news:OFhL6aBzIHA.3884@T......
>> I assume you must do this over the internet; that you do not have local 
>> access to the file, but it will help to know that for sure.
>>
>> If you can access the file locally, then Windows has a few functions that 
>> will help.
>>
>> If you cannot access the file locally and must query over the internet, 
>> then it is possible to query the last modified date and time of a file. 
>> If you do that, then you don't need to read all the data just to 
>> determine if it has changed. I forget how to do it; it is something I 
>> wanted to do a couple of weeks ago but I can't find any of the samples I 
>> have of doing it. I thought the data was part of the HTTP headers but I 
>> don't find it there. Getting the last update time of a file over the 
>> internet is a very common thing to do and I am sure we could find the 
>> answer easily if that will help you. I just did not pursue it further 
>> when I was looking a couple of weeks ago but I know I have samples 
>> somewhere in my system.
>>
>>
>> "Elliot" <elliot_barclay@h...> wrote in message 
>> news:223B8966-8D9E-46FE-89BD-C408E1741988@m......
>>>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.
>>>
>>
>>
>>
>