using System;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        var jobId = "N121212";

        var folder = Prefix(jobId);

        Console.WriteLine(jobId + ": " + folder);

    }

    public static string Prefix(string jobId)

    {

        if (string.IsNullOrWhiteSpace(jobId)) 

            throw new Exception("Job id is required to generate folder");

​

        var value = $"{jobId}_BDO";

        var prefix = CreateMd5Checksum(value).ToLowerInvariant();

        return prefix;

    }

​

    public static string CreateMd5Checksum(string value)

    {

        var inputBytes = System.Text.Encoding.ASCII.GetBytes(value);

        var hashBytes = System.Security.Cryptography.MD5.Create().ComputeHash(inputBytes);

​

        var checksum = Convert.ToHexString(hashBytes);

        return checksum;

    }

}