生成随机数的两个方法

 private static char[] constant ={
                                        '0','1','2','3','4','5','6','7','8','9',
                                        'a','b','c','d','e','f','g','h','i','j',
                                        'k','l','m','n','o','p','q','r','s','t',
                                        'u','v','w','x','y','z'
                                    };
        public static string GenerateRandom(int Length)
        {
            System.Text.StringBuilder newRandom = new System.Text.StringBuilder(36);
            Random rd = new Random();
            for (int i = 0; i < Length; i++)
            {
                newRandom.Append(constant[rd.Next(36)]);
            }
            return newRandom.ToString();
        }


protected static string GetMixPwd(int num)//生成混合随机数
        {
            string a = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < num; i++)
            {
                sb.Append(a[new Random(Guid.NewGuid().GetHashCode()).Next(0, a.Length - 1)]);
            }

            return sb.ToString();
        }