a, C# - rextester

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Security.Cryptography;
using System.Text;

namespace Rextester
{
    public class Program
    {
        
        
        public static string MD5Sifrele(string metin)
        {
            MD5CryptoServiceProvider MD5HASH = new MD5CryptoServiceProvider();
            byte[] btr = Encoding.UTF8.GetBytes(metin);
            btr = MD5HASH.ComputeHash(btr);
            StringBuilder sb = new StringBuilder();
            foreach (byte ba in btr)
            {
                sb.Append(ba.ToString("X2"));
            }
            return sb.ToString();
        }
        
        public static void Main(string[] args)
        {
            string sabit      = "956845125647123";
            string mailadresi = "drinkingsage@decompile.us";//SADECE BURAYA MAİL ADRESİ GİRİNİZ...
            string sistemkodu = "DB00B3FEF5C66F47CFFA2B2046717C5B";//PROGRAMIN SİZE VERDİĞİ SİSTEM KODUNU GİRİNİZ.
            Console.WriteLine("Sistem Kodu : "+sistemkodu+"\n"+"Lisans Mail : "+mailadresi+"\n"+"Sistem Kodu : " + MD5Sifrele(sistemkodu+mailadresi+sabit));
        }
    }
}

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Compilation time: 0,16 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 13 Mb, average nr of threads: 3