c# - Class For generating Random Code -


i wrote class generate random code, shouldn't create 2 repetitive number. want know, in code, how possible have collision?

 public string myrandom()  {     random r = new random();     int x = r.next(1000);//max range     persiancalendar pc = new persiancalendar();      string _myrandom = pc.getmonth(datetime.now).tostring() + pc.getdayofmonth(datetime.now).tostring() + pc.gethour(datetime.now).tostring() + pc.getminute(datetime.now).tostring() + pc.getsecond(datetime.now).tostring() + pc.getmilliseconds(datetime.now).tostring() + x.tostring();      return _myrandom;  }

if do

list<string> s = new list<string>();  for(int = 0; < 100; i++) {     s.add(myrandom()); }

why? when random class created in loop, can duplicate random numbers. more info

solution: create random instance outside loop.


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