using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        TestRandomIdGenerator();

    }

    public static void TestRandomIdGenerator()

    {

        // create five IDs of six, base 62 characters

        for (int i=0; i<5; i++) Console.WriteLine(RandomIdGenerator.GetBase62(6));

​

        // create five IDs of eight base 36 characters

        for (int i=0; i<5; i++) Console.WriteLine(RandomIdGenerator.GetBase36(8));

    }

​

    public static class RandomIdGenerator 

    {

        private static char[] _base62chars = 

            "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

            .ToCharArray();

​

        private static Random _random = new Random();

​

        public static string GetBase62(int length) 

        {

            var sb = new StringBuilder(length);

​

            for (int i=0; i<length; i++) 

                sb.Append(_base62chars[_random.Next(62)]);

​

            return sb.ToString();

        }       

​

        public static string GetBase36(int length) 

        {

            var sb = new StringBuilder(length);

​

            for (int i=0; i<length; i++) 

                sb.Append(_base62chars[_random.Next(36)]);

​

            return sb.ToString();

        }

    }

}