c# - Setting up an elapsed timer event -

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i need measure time difference between when last packet received , new 1 has arrived. have tried using timer class in c# such:

while (listening)             {                 if (hb != null)                 {                     interval = hb.gethbinterval();                     atimer = new system.timers.timer(interval+5);                     console.writeline("interval is: {0}", interval);                         byte[] bytes = listener.receive(ref groupep);                     decodeudpmessage(encoding.utf8.getstring(bytes, 0, bytes.length));                 }                 else                 {                     byte[] bytes = listener.receive(ref groupep);                     decodeudpmessage(encoding.utf8.getstring(bytes, 0, bytes.length));                 }             }

i had event called if timer elapsed after length of time of interval. realised timer wait length of interval , call event. need figure out is, can work out difference of when packet came last , when new 1 has arrived. if can need evaluate against interval value , if greater call method work.

my brain has died trying figure out appreciated.

you should store datetime.now , compare against stored value.

for example:

var lasttime = datetime.now; //do things... if ((datetime.now - lasttime).totalseconds > 5)     //do other things

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