c# - Win8 App - WCF - how to fire timer event only once? -

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i wrote win8 app calling wcf every minute data. win8 app shared via sideloading , i've got 10 clients app running.

so problem - i've got call special method in wcf every 10 minutes. once because method should send emails , don't want them sent 10 times. don't want method called every client either have set timer in win8 app. how set timer who's firing event once every 10 minutes?

i've tried set timer in wcf it's not practice guess (and didn't work)?! , i'm not allowed write windows service etc. firing timer event.

am thinking complicated or isn't easy? should work backgroundthreads? missunderstand sideloading? wouldn't timer event fired 10 clients every 10 minutes? guess because every single client gets other data wcf too.....


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