asp.net - Autogenerated number with the use of date and time c# -

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having trouble on how going autogenerate number use of date , time. example, need generate kind of number, 16-9685 with, 16 = year , 9685 randomized , shown in textbox. tried 1 unfortunately, doesn't work. helping

var random = new random(system.datetime.now.year); int randomnumber = random.next(-1000, -1); textboxsesid.text = randomnumber.tostring(); 

// keep _r member, not local random _r = new random(); ...  // gen random number int rand = _r.next(1, 10000);  // "2016-" prefix string yearprefix = datetime.now.year + "-";  // remove first 2 digits of year prefix, "16-" yearprefix = yearprefix.substring(2);  // put year prefix random number textbox textboxsesid.text = yearprefix + rand;

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