c# - generating a batch of random passwords -

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generating random password easy. generating batch more difficult.

    public static string getrandompassword(int letters, int getallen) {         //int letters = 8;         //int getallen = 5;          char[] letterdeel = new char[letters];         int mingetal = (int)math.pow(10, getallen - 1);         int maxgetal = (int)math.pow(10, getallen);          string password;         random r = new random();         int test = (int)(datetime.now.ticks);         (int = 0; < letters; i++) {             r = new random((int)(datetime.now.ticks) + i);             bool capital = r.next(2) == 0 ? true : false;             if (capital) {                 letterdeel[i] = (char)r.next(65, 91);             } else {                 letterdeel[i] = (char)r.next(97, 123);             }         }          password = new string(letterdeel);         password += r.next(mingetal, maxgetal);          return password;     }

this method, passwords should in letter-number format. works fine, if have for loop pulling 100 passwords method, in array have 5-8 same passwords, again 5-8 same pass.

i know why is, because of random function , clock depends on, how fix this?

define random number generator static outside of function.

how can true randomness in class without thread.sleep(300)?


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