public string GetBothUpperAndLower(int length) { var pwd = ""; for (var i = 0; i < length; i++) { if (_randomNumberGenerator.GetRandomIntegerBetween(new Range(0, 9)) % 2 == 0) { pwd += _randomNumberGenerator.GetRandomLetterUpper(); } else { pwd += _randomNumberGenerator.GetRandomLetterLower(); } } return(pwd); }