c# 生成指定位數的隨機字符串

  string getString(int count) { int number; string checkCode = String.Empty; //存放隨機碼的字符串 System.Random random = new Random(); for (int i = 0; i < count; i++) //產生4位校驗碼 { number = random.Next(); number = number % 36; if (number < 10) { number += 48; //數字0-9編碼在48-57 } else { number += 55; //字母A-Z編碼在65-90 } checkCode += ((char)number).ToString(); } return checkCode； }