c# - How to count seconds and then use them in a conditional? -


i newbie programmer , i've been trying deal problem on 2 hours now. want program count seconds , if gets past second second (what?), something, example show "game over" or that. problem is, program doesn't after these 2 seconds have passed. might problem ?

edit: ok here whole info behind this. user has press key corresponding character shown on screen in 2 seconds. if user doesn't press key in 2 seconds or presses wrong key, game has over, doesn't work expected lol

here whole code far (yes know goto sucks , change loop later):

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.globalization; using system.threading; using system.diagnostics;  class game {     static void main()     {     start:         console.cursorvisible = false;         random rnd = new random();         int row = rnd.next(1, 80);         int col = rnd.next(1, 25);         int chars = rnd.next(0, 62);         string lettersandchars = "";         lettersandchars = lettersandchars.toupper();         console.setcursorposition(row, col);         if (chars <= 10)         {             lettersandchars += (char)(chars + '0');         }         else         {             lettersandchars += (char)(chars + 'a');         }         lettersandchars = lettersandchars.toupper();         console.writeline(lettersandchars);         datetime endtime = datetime.now.addseconds(2);         var keypress = console.readkey();         string keypressstring = keypress.keychar.tostring();         keypressstring = keypressstring.toupper();         if (keypressstring == lettersandchars && datetime.now < endtime)         {             console.clear();             goto start;         }         else if (keypressstring != lettersandchars || datetime.now > endtime)         {             console.clear();             console.writeline("game over");         }       } }

i wouldn't use timer. can following:

datetime endtime = datetime.now.addseconds(2); while (!console.keyavailable && datetime.now < endtime)     thread.sleep(1); if (console.keyavailable) {     var keypress = console.readkey();     string keypressstring = keypress.keychar.tostring();     keypressstring = keypressstring.toupper();     if (keypressstring == lettersandchars)     {         console.clear();         goto start;     } } console.clear(); console.writeline("game over");

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