如何生成随机码

 1         public static Char[] CharArray = new Char[] { 
 2             ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘b‘,
 3             ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘i‘, ‘g‘, ‘k‘, ‘l‘, ‘m‘, ‘n‘, ‘o‘, ‘p‘,
 4             ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘, ‘w‘, ‘x‘, ‘y‘, ‘z‘ };
 5 
 6         public static string GenerateVerifyCode()
 7         {
 8             Random r=new Random();
 9             string tmp = "";
10             while (tmp.Length < 6)
11             {
12                 tmp += CharArray[r.Next(CharArray.Length)];
13             }
14             return tmp; 
15         }