CAPTCHA.Captcha.GetRandomPassword C# (CSharp) Method

        public string GetRandomPassword(int length)
        {
            char[] chars = "$%#@!*abcdefghijklmnopqrstuvwxyz1234567890?;:ABCDEFGHIJKLMNOPQRSTUVWXYZ^&".ToCharArray();
            string password = string.Empty;

            for (int i = 0; i < length; i++)
            {
                int x = random.Next(1, chars.Length);
                //Don't Allow Repetation of Characters
                if (!password.Contains(chars.GetValue(x).ToString()))
                    password += chars.GetValue(x);
                else
                    i--;
            }
            return password;
        }
    }