md5 in C#

gistfile1.txt

using System;
using System.IO;
using System.Security.Cryptography;

class test {
    static void Main(string[] args) {

        string file = "";

        if (args.Length > 0) {
            file = args[0];

            FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read);
            
            BinaryReader r = new BinaryReader(fs);
            byte[] d = new byte[fs.Length];
            d = r.ReadBytes((int)fs.Length);

            byte[] result = MD5hash(d);
            string s = "";
            foreach (byte b in result) {
                s += b.ToString("x2");
            }
            Console.WriteLine(s.ToUpper());
        }
    }

    static byte[] MD5hash (byte[] data) {
 
        MD5 md5 = new MD5CryptoServiceProvider();

        byte[] result = md5.ComputeHash(data);

        return result;
     }
}